| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 31 | 
                                    
                                    10%
                                 | 
| 1 | One hour or less | 3 | 
                                    
                                    1%
                                 | 
| 4 | 1 | 
                                    
                                    0.3%
                                 | |
| 5 | 1 | 
                                    
                                    0.3%
                                 | |
| 7 | 2 | 
                                    
                                    0.6%
                                 | |
| 8 | 1 | 
                                    
                                    0.3%
                                 | |
| 10 | 2 | 
                                    
                                    0.6%
                                 | |
| 12 | 5 | 
                                    
                                    1.6%
                                 | |
| 14 | 2 | 
                                    
                                    0.6%
                                 | |
| 15 | 5 | 
                                    
                                    1.6%
                                 | |
| 16 | 1 | 
                                    
                                    0.3%
                                 | |
| 18 | 1 | 
                                    
                                    0.3%
                                 | |
| 20 | 6 | 
                                    
                                    1.9%
                                 | |
| 24 | 8 | 
                                    
                                    2.6%
                                 | |
| 25 | 1 | 
                                    
                                    0.3%
                                 | |
| 27 | 1 | 
                                    
                                    0.3%
                                 | |
| 30 | 13 | 
                                    
                                    4.2%
                                 | |
| 32 | 3 | 
                                    
                                    1%
                                 | |
| 36 | 3 | 
                                    
                                    1%
                                 | |
| 38 | 1 | 
                                    
                                    0.3%
                                 | |
| 40 | 7 | 
                                    
                                    2.3%
                                 | |
| 48 | 15 | 
                                    
                                    4.8%
                                 | |
| 50 | 7 | 
                                    
                                    2.3%
                                 | |
| 56 | 4 | 
                                    
                                    1.3%
                                 | |
| 60 | 6 | 
                                    
                                    1.9%
                                 | |
| 64 | 1 | 
                                    
                                    0.3%
                                 | |
| 65 | 1 | 
                                    
                                    0.3%
                                 | |
| 70 | 3 | 
                                    
                                    1%
                                 | |
| 72 | 4 | 
                                    
                                    1.3%
                                 | |
| 80 | 18 | 
                                    
                                    5.8%
                                 | |
| 86 | 1 | 
                                    
                                    0.3%
                                 | |
| 90 | 12 | 
                                    
                                    3.9%
                                 | |
| 92 | 1 | 
                                    
                                    0.3%
                                 | |
| 96 | 14 | 
                                    
                                    4.5%
                                 | |
| 100 | 13 | 
                                    
                                    4.2%
                                 | |
| 110 | 1 | 
                                    
                                    0.3%
                                 | |
| 112 | 2 | 
                                    
                                    0.6%
                                 | |
| 120 | 5 | 
                                    
                                    1.6%
                                 | |
| 126 | 1 | 
                                    
                                    0.3%
                                 | |
| 140 | 2 | 
                                    
                                    0.6%
                                 | |
| 144 | 1 | 
                                    
                                    0.3%
                                 | |
| 150 | 8 | 
                                    
                                    2.6%
                                 | |
| 160 | 33 | 
                                    
                                    10.6%
                                 | |
| 180 | 5 | 
                                    
                                    1.6%
                                 | |
| 192 | 3 | 
                                    
                                    1%
                                 | |
| 200 | 14 | 
                                    
                                    4.5%
                                 | |
| 208 | 1 | 
                                    
                                    0.3%
                                 | |
| 220 | 1 | 
                                    
                                    0.3%
                                 | |
| 240 | 8 | 
                                    
                                    2.6%
                                 | |
| 245 | 1 | 
                                    
                                    0.3%
                                 | |
| 250 | 1 | 
                                    
                                    0.3%
                                 | |
| 256 | 2 | 
                                    
                                    0.6%
                                 | |
| 260 | 3 | 
                                    
                                    1%
                                 | |
| 270 | 1 | 
                                    
                                    0.3%
                                 | |
| 288 | 1 | 
                                    
                                    0.3%
                                 | |
| 320 | 7 | 
                                    
                                    2.3%
                                 | |
| 324 | 1 | 
                                    
                                    0.3%
                                 | |
| 340 | 1 | 
                                    
                                    0.3%
                                 | |
| 345 | 1 | 
                                    
                                    0.3%
                                 | |
| 360 | 2 | 
                                    
                                    0.6%
                                 | |
| 365 | 1 | 
                                    
                                    0.3%
                                 | |
| 375 | 1 | 
                                    
                                    0.3%
                                 | |
| 400 | 4 | 
                                    
                                    1.3%
                                 | |
| 800 | 1 | 
                                    
                                    0.3%
                                 |