Incidence rate and 95% confidence interval (CI) per 1000 male live births of autism spectrum disorder (ASD), by month of conception
| Month of conception | ASD cases | Rate (per 1000) | 95% CI* | |
| January | 87 | 9.2 | 7.4 | 11.3 |
| February | 74 | 8.7 | 6.9 | 11 |
| March | 77 | 8.3 | 6.6 | 10.4 |
| April | 72 | 8.0 | 6.3 | 10.1 |
| May | 77 | 8.4 | 6.7 | 10.5 |
| June | 68 | 7.8 | 6.1 | 9.9 |
| July | 72 | 8.2 | 6.4 | 10.3 |
| August | 89 | 10.2 | 8.2 | 12.5 |
| September | 91 | 10.9 | 8.8 | 13.4 |
| October | 79 | 8.4 | 6.6 | 10.4 |
| November | 99 | 10.8 | 8.8 | 13.1 |
| December | 87 | 9.1 | 7.3 | 11.2 |
| Total | 972 | 9.0 | 8.4 | 9.9 |
*See text for details.