| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 50 | 
                                    
                                    12.4%
                                 | 
| 1 | One hour or less | 5 | 
                                    
                                    1.2%
                                 | 
| 2 | 1 | 
                                    
                                    0.2%
                                 | |
| 3 | 1 | 
                                    
                                    0.2%
                                 | |
| 12 | 1 | 
                                    
                                    0.2%
                                 | |
| 15 | 1 | 
                                    
                                    0.2%
                                 | |
| 20 | 3 | 
                                    
                                    0.7%
                                 | |
| 24 | 1 | 
                                    
                                    0.2%
                                 | |
| 25 | 2 | 
                                    
                                    0.5%
                                 | |
| 30 | 14 | 
                                    
                                    3.5%
                                 | |
| 35 | 2 | 
                                    
                                    0.5%
                                 | |
| 36 | 3 | 
                                    
                                    0.7%
                                 | |
| 40 | 10 | 
                                    
                                    2.5%
                                 | |
| 45 | 1 | 
                                    
                                    0.2%
                                 | |
| 50 | 8 | 
                                    
                                    2%
                                 | |
| 52 | 1 | 
                                    
                                    0.2%
                                 | |
| 60 | 3 | 
                                    
                                    0.7%
                                 | |
| 66 | 1 | 
                                    
                                    0.2%
                                 | |
| 70 | 1 | 
                                    
                                    0.2%
                                 | |
| 76 | 1 | 
                                    
                                    0.2%
                                 | |
| 80 | 3 | 
                                    
                                    0.7%
                                 | |
| 90 | 1 | 
                                    
                                    0.2%
                                 | |
| 96 | 4 | 
                                    
                                    1%
                                 | |
| 100 | 18 | 
                                    
                                    4.5%
                                 | |
| 120 | 24 | 
                                    
                                    6%
                                 | |
| 130 | 1 | 
                                    
                                    0.2%
                                 | |
| 140 | 1 | 
                                    
                                    0.2%
                                 | |
| 144 | 1 | 
                                    
                                    0.2%
                                 | |
| 150 | 14 | 
                                    
                                    3.5%
                                 | |
| 160 | 5 | 
                                    
                                    1.2%
                                 | |
| 164 | 1 | 
                                    
                                    0.2%
                                 | |
| 170 | 2 | 
                                    
                                    0.5%
                                 | |
| 174 | 1 | 
                                    
                                    0.2%
                                 | |
| 176 | 1 | 
                                    
                                    0.2%
                                 | |
| 180 | 6 | 
                                    
                                    1.5%
                                 | |
| 190 | 1 | 
                                    
                                    0.2%
                                 | |
| 192 | 1 | 
                                    
                                    0.2%
                                 | |
| 200 | 15 | 
                                    
                                    3.7%
                                 | |
| 220 | 2 | 
                                    
                                    0.5%
                                 | |
| 240 | 7 | 
                                    
                                    1.7%
                                 | |
| 249 | 1 | 
                                    
                                    0.2%
                                 | |
| 250 | 11 | 
                                    
                                    2.7%
                                 | |
| 280 | 1 | 
                                    
                                    0.2%
                                 | |
| 288 | 2 | 
                                    
                                    0.5%
                                 | |
| 300 | 19 | 
                                    
                                    4.7%
                                 | |
| 320 | 1 | 
                                    
                                    0.2%
                                 | |
| 328 | 1 | 
                                    
                                    0.2%
                                 | |
| 336 | 1 | 
                                    
                                    0.2%
                                 | |
| 350 | 2 | 
                                    
                                    0.5%
                                 | |
| 360 | 4 | 
                                    
                                    1%
                                 | |
| 400 | 15 | 
                                    
                                    3.7%
                                 | |
| 440 | 2 | 
                                    
                                    0.5%
                                 | |
| 450 | 4 | 
                                    
                                    1%
                                 | |
| 470 | 1 | 
                                    
                                    0.2%
                                 | |
| 480 | 17 | 
                                    
                                    4.2%
                                 | |
| 490 | 1 | 
                                    
                                    0.2%
                                 | |
| 500 | 24 | 
                                    
                                    6%
                                 | |
| 520 | 1 | 
                                    
                                    0.2%
                                 | |
| 540 | 1 | 
                                    
                                    0.2%
                                 | |
| 550 | 1 | 
                                    
                                    0.2%
                                 | |
| 570 | 1 | 
                                    
                                    0.2%
                                 | |
| 600 | 8 | 
                                    
                                    2%
                                 | |
| 620 | 1 | 
                                    
                                    0.2%
                                 | |
| 700 | 4 | 
                                    
                                    1%
                                 | |
| 770 | 1 | 
                                    
                                    0.2%
                                 | |
| 800 | 4 | 
                                    
                                    1%
                                 | |
| 840 | 1 | 
                                    
                                    0.2%
                                 | |
| 860 | 1 | 
                                    
                                    0.2%
                                 | |
| 900 | 1 | 
                                    
                                    0.2%
                                 | |
| 960 | 3 | 
                                    
                                    0.7%
                                 | |
| 1000 | 10 | 
                                    
                                    2.5%
                                 | |
| 1020 | 1 | 
                                    
                                    0.2%
                                 | |
| 1040 | 1 | 
                                    
                                    0.2%
                                 | |
| 1080 | 2 | 
                                    
                                    0.5%
                                 | |
| 1152 | 1 | 
                                    
                                    0.2%
                                 | |
| 1200 | 1 | 
                                    
                                    0.2%
                                 | |
| 1400 | 1 | 
                                    
                                    0.2%
                                 | |
| 1450 | 1 | 
                                    
                                    0.2%
                                 | |
| 1500 | 1 | 
                                    
                                    0.2%
                                 | |
| 1800 | 1 | 
                                    
                                    0.2%
                                 | |
| 1920 | 1 | 
                                    
                                    0.2%
                                 | |
| 2000 | 11 | 
                                    
                                    2.7%
                                 | |
| 2016 | 1 | 
                                    
                                    0.2%
                                 | |
| 2088 | 1 | 
                                    
                                    0.2%
                                 | |
| 2100 | 1 | 
                                    
                                    0.2%
                                 | |
| 2160 | 2 | 
                                    
                                    0.5%
                                 | |
| 2200 | 1 | 
                                    
                                    0.2%
                                 | |
| 2400 | 1 | 
                                    
                                    0.2%
                                 | |
| 2500 | 2 | 
                                    
                                    0.5%
                                 | |
| 2880 | 1 | 
                                    
                                    0.2%
                                 | |
| 3000 | 2 | 
                                    
                                    0.5%
                                 | |
| 4000 | 1 | 
                                    
                                    0.2%
                                 | |
| 4176 | 1 | 
                                    
                                    0.2%
                                 | |
| 8000 | 1 | 
                                    
                                    0.2%
                                 | |
| 8760 | 1 | 
                                    
                                    0.2%
                                 |