| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 382 | 
                                                                 
                                    
                                    31.4%
                                 
                                                             | 
                                                        
                    
| 1 | One hour or less | 27 | 
                                                                 
                                    
                                    2.2%
                                 
                                                             | 
                                                        
                    
| 2 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 3 | 2 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 4 | 3 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 5 | 2 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 6 | 2 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 10 | 2 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 12 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 14 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 15 | 2 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 16 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 18 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 20 | 9 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 24 | 9 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 25 | 6 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 30 | 104 | 
                                                                 
                                    
                                    8.6%
                                 
                                                             | 
                                                        
                    |
| 32 | 15 | 
                                                                 
                                    
                                    1.2%
                                 
                                                             | 
                                                        
                    |
| 33 | 8 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 34 | 2 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 35 | 32 | 
                                                                 
                                    
                                    2.6%
                                 
                                                             | 
                                                        
                    |
| 36 | 8 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 37 | 4 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 40 | 85 | 
                                                                 
                                    
                                    7%
                                 
                                                             | 
                                                        
                    |
| 41 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 42 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 44 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 45 | 15 | 
                                                                 
                                    
                                    1.2%
                                 
                                                             | 
                                                        
                    |
| 48 | 12 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 50 | 68 | 
                                                                 
                                    
                                    5.6%
                                 
                                                             | 
                                                        
                    |
| 53 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 55 | 3 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 60 | 52 | 
                                                                 
                                    
                                    4.3%
                                 
                                                             | 
                                                        
                    |
| 65 | 2 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 70 | 17 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 72 | 6 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 80 | 45 | 
                                                                 
                                    
                                    3.7%
                                 
                                                             | 
                                                        
                    |
| 85 | 2 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 90 | 13 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 96 | 3 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 98 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 100 | 55 | 
                                                                 
                                    
                                    4.5%
                                 
                                                             | 
                                                        
                    |
| 120 | 15 | 
                                                                 
                                    
                                    1.2%
                                 
                                                             | 
                                                        
                    |
| 125 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 130 | 4 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 140 | 3 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 150 | 33 | 
                                                                 
                                    
                                    2.7%
                                 
                                                             | 
                                                        
                    |
| 160 | 9 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 168 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 170 | 3 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 176 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 179 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 180 | 6 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 190 | 2 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 192 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 200 | 50 | 
                                                                 
                                    
                                    4.1%
                                 
                                                             | 
                                                        
                    |
| 230 | 2 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 240 | 8 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 250 | 13 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 260 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 280 | 4 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 300 | 17 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 322 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 360 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 400 | 6 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 450 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 480 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 500 | 6 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 600 | 4 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 650 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 700 | 2 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 750 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 800 | 2 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 900 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 1000 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 1350 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 1400 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 1500 | 3 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 3500 | 1 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             |