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Table 1 Boys born during 1964–2000

From: Long-term significant seasonal differences in the numbers of new-borns with an orofacial cleft in the Czech Republic – a retrospective study

Month I II III IV V VI VII VIII IX X XI XII
NC Σ 221,358 208,245 244,215 241,422 220,682 229,161 230,717 217,741 213,307 203,066 193,035 199,661
N 37 37 37 37 37 37 37 37 37 37 37 37
5982.65 5628,24 6600.41 6524.92 5964.38 6193.54 6235.59 5884.89 5765.05 5488.27 5217.16 5396.24
SE 198.91 201.76 245.50 241.65 374.36 209.70 203.04 185.84 192.77 188.69 178.70 195.72
CL Σ 74 77 72 67 71 72 64 88 69 68 54 56
N 37 37 37 37 37 37 37 37 37 37 37 37
2.00 2.08 1.95 1.81 1.92 1.95 1.73 2.38 1.86 1.84 1.46 1.51
SE 0.22 0.25 0.25 0.21 0.24 0.22 0.23 0.30 0.23 0.23 0.20 0.20
CLP Σ 108 129 132 133 155 142 133 138 102 98 109 118
N 37 37 37 37 37 37 37 37 37 37 37 37
2.92 3.49 3.57 3.59 4.19 3.84 3.59 3.73 2.76 2.65 2.95 3.19
SE 0.28 0.38 0.30 0.32 0.38 0.36 0.30 0.36 0.26 0.34 0.31 0.33
CP Σ 75 70 78 60 98 70 85 72 71 77 61 64
N 37 37 37 37 37 37 37 37 37 37 37 37
2.03 1.89 2.11 1.62 2.65 1.89 2.30 1.95 1.92 2.08 1.65 1.73
SE 0.27 0.26 0.22 0.22 0.32 0.25 0.20 0.22 0.25 0.26 0.23 0.21
  1. Groups of boys: NC non-cleft control, CL cleft lip, CLP cleft lip and palate, CP cleft palate
  2. Σ - total monthly number corresponding to all boys that born in a given month for 37 years; N – number of years; x̄ – mean monthly number of newborn boys;
  3. SE – standard error of the mean