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Table 2 Girls 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 207,032 198,352 230,452 229,166 230,680 216,559 218,629 207,749 201,606 192,596 182,260 189,343
N 37 37 37 37 37 37 37 37 37 37 37 37
5595.46 5360.86 6228.43 6193.68 6234.59 5852.95 5908.89 5614.84 5448.81 5205.30 4925.95 5117.38
SE 196.73 192.24 230.57 229.77 223.85 196.62 192.30 191.31 183.63 177.38 172.90 181.12
CL Σ 29 36 61 58 41 46 44 39 45 35 36 40
N 37 37 37 37 37 37 37 37 37 37 37 37
0.78 0.97 1.65 1.57 1.11 1.24 1.19 1.05 1.22 0.95 0.97 1.08
SE 0.13 0.15 0.26 0.22 0.18 0.18 0.17 0.18 0.18 0.14 0.17 0.20
CLP Σ 60 68 68 64 73 65 60 52 63 48 50 56
N 37 37 37 37 37 37 37 37 37 37 37 37
1.62 1.84 1.84 1.73 1.97 1.76 1.62 1.41 1.70 1.30 1.35 1.51
SE 0.24 0.27 0.20 0.20 0.23 0.21 0.20 0.21 0.25 0.19 0.20 0.22
CP Σ 98 96 107 104 101 98 111 91 91 93 84 92
N 37 37 37 37 37 37 37 37 37 37 37 37
2.65 2.59 2.89 2.81 2.73 2.65 3.00 2.46 2.46 2.51 2.27 2.49
SE 0.25 0.30 0.31 0.32 0.31 0.28 0.24 0.28 0.28 0.25 0.24 0.30
  1. Groups of girls: NC non-cleft control, CL cleft lip, CLP cleft lip and palate, CP cleft palate
  2. Σ - total monthly number corresponding to all girls that born in a given month for 37 years; N – number of years; x̄ – mean monthly number of newborn girls; SE – standard error of the mean