| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 792 | 
                                    
                                    55.9%
                                 | 
| 1 | One hour or less | 130 | 
                                    
                                    9.2%
                                 | 
| 2 | 3 | 
                                    
                                    0.2%
                                 | |
| 3 | 5 | 
                                    
                                    0.4%
                                 | |
| 4 | 1 | 
                                    
                                    0.1%
                                 | |
| 5 | 6 | 
                                    
                                    0.4%
                                 | |
| 6 | 1 | 
                                    
                                    0.1%
                                 | |
| 7 | 1 | 
                                    
                                    0.1%
                                 | |
| 8 | 1 | 
                                    
                                    0.1%
                                 | |
| 10 | 7 | 
                                    
                                    0.5%
                                 | |
| 12 | 5 | 
                                    
                                    0.4%
                                 | |
| 13 | 1 | 
                                    
                                    0.1%
                                 | |
| 20 | 4 | 
                                    
                                    0.3%
                                 | |
| 24 | 5 | 
                                    
                                    0.4%
                                 | |
| 30 | 33 | 
                                    
                                    2.3%
                                 | |
| 32 | 3 | 
                                    
                                    0.2%
                                 | |
| 35 | 10 | 
                                    
                                    0.7%
                                 | |
| 36 | 5 | 
                                    
                                    0.4%
                                 | |
| 40 | 11 | 
                                    
                                    0.8%
                                 | |
| 45 | 2 | 
                                    
                                    0.1%
                                 | |
| 48 | 8 | 
                                    
                                    0.6%
                                 | |
| 50 | 18 | 
                                    
                                    1.3%
                                 | |
| 52 | 3 | 
                                    
                                    0.2%
                                 | |
| 56 | 1 | 
                                    
                                    0.1%
                                 | |
| 60 | 37 | 
                                    
                                    2.6%
                                 | |
| 68 | 1 | 
                                    
                                    0.1%
                                 | |
| 70 | 4 | 
                                    
                                    0.3%
                                 | |
| 72 | 24 | 
                                    
                                    1.7%
                                 | |
| 75 | 1 | 
                                    
                                    0.1%
                                 | |
| 80 | 17 | 
                                    
                                    1.2%
                                 | |
| 84 | 5 | 
                                    
                                    0.4%
                                 | |
| 85 | 1 | 
                                    
                                    0.1%
                                 | |
| 90 | 5 | 
                                    
                                    0.4%
                                 | |
| 96 | 30 | 
                                    
                                    2.1%
                                 | |
| 100 | 28 | 
                                    
                                    2%
                                 | |
| 108 | 6 | 
                                    
                                    0.4%
                                 | |
| 120 | 37 | 
                                    
                                    2.6%
                                 | |
| 140 | 1 | 
                                    
                                    0.1%
                                 | |
| 144 | 12 | 
                                    
                                    0.8%
                                 | |
| 150 | 14 | 
                                    
                                    1%
                                 | |
| 156 | 1 | 
                                    
                                    0.1%
                                 | |
| 170 | 3 | 
                                    
                                    0.2%
                                 | |
| 180 | 1 | 
                                    
                                    0.1%
                                 | |
| 190 | 2 | 
                                    
                                    0.1%
                                 | |
| 200 | 21 | 
                                    
                                    1.5%
                                 | |
| 216 | 2 | 
                                    
                                    0.1%
                                 | |
| 225 | 1 | 
                                    
                                    0.1%
                                 | |
| 240 | 5 | 
                                    
                                    0.4%
                                 | |
| 250 | 12 | 
                                    
                                    0.8%
                                 | |
| 260 | 2 | 
                                    
                                    0.1%
                                 | |
| 270 | 2 | 
                                    
                                    0.1%
                                 | |
| 280 | 1 | 
                                    
                                    0.1%
                                 | |
| 288 | 3 | 
                                    
                                    0.2%
                                 | |
| 300 | 23 | 
                                    
                                    1.6%
                                 | |
| 335 | 1 | 
                                    
                                    0.1%
                                 | |
| 350 | 3 | 
                                    
                                    0.2%
                                 | |
| 360 | 3 | 
                                    
                                    0.2%
                                 | |
| 365 | 1 | 
                                    
                                    0.1%
                                 | |
| 385 | 1 | 
                                    
                                    0.1%
                                 | |
| 400 | 6 | 
                                    
                                    0.4%
                                 | |
| 450 | 1 | 
                                    
                                    0.1%
                                 | |
| 480 | 2 | 
                                    
                                    0.1%
                                 | |
| 500 | 9 | 
                                    
                                    0.6%
                                 | |
| 600 | 2 | 
                                    
                                    0.1%
                                 | |
| 648 | 1 | 
                                    
                                    0.1%
                                 | |
| 700 | 1 | 
                                    
                                    0.1%
                                 | |
| 720 | 4 | 
                                    
                                    0.3%
                                 | |
| 800 | 2 | 
                                    
                                    0.1%
                                 | |
| 900 | 1 | 
                                    
                                    0.1%
                                 | |
| 960 | 2 | 
                                    
                                    0.1%
                                 | |
| 1000 | 4 | 
                                    
                                    0.3%
                                 | |
| 1080 | 1 | 
                                    
                                    0.1%
                                 | |
| 1092 | 1 | 
                                    
                                    0.1%
                                 | |
| 1200 | 3 | 
                                    
                                    0.2%
                                 | |
| 1300 | 1 | 
                                    
                                    0.1%
                                 | |
| 1400 | 1 | 
                                    
                                    0.1%
                                 | |
| 1440 | 1 | 
                                    
                                    0.1%
                                 | |
| 1500 | 1 | 
                                    
                                    0.1%
                                 | |
| 2000 | 1 | 
                                    
                                    0.1%
                                 | |
| 2080 | 1 | 
                                    
                                    0.1%
                                 | |
| 4160 | 1 | 
                                    
                                    0.1%
                                 | |
| 4320 | 1 | 
                                    
                                    0.1%
                                 | |
| 8000 | 1 | 
                                    
                                    0.1%
                                 |