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The effect of season and month of last menstrual period on the prevalence of CDH.
| Season and month | CDH cases | P |
|---|---|---|
| Spring | 21 | 0.009 |
| April | 6 | |
| May | 11 | |
| June | 4 | |
| Summer | 22 | |
| July | 4 | |
| August | 9 | |
| September | 9 | |
| Fall | 7 | |
| October | 1 | |
| November | 4 | |
| December | 2 | |
| Winter | 10 | |
| January | 4 | |
| February | 2 | |
| march | 4 |
