Table 3
Observed (Obs) Crohn's disease (CD) births versus expected (Exp) by season
Jan–Mar
Apr–Jun
Jul–Sep
Oct–Dec
Total
CD births
267
261
234
206
968
Exp births
245.48
250.49
241.39
230.65
Obs/Exp
1.088
1.042
0.97
0.89