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Table 1 Binomial probability analysis of births by Indian-born women living in Norway, by sex and birth order, 1969-2012

From: Changing trend? Sex ratios of children born to Indian immigrants in Norway revisited

  Period
  1969-1986 1987-1996 1997-2005 2006-2012
First order births
Male births/all births 187/378 259/543 258/533 357/702
Percentage boys 49.5 47.7 48.4 50.9
z −0.735 −1.707 −1.365 −0.268
Second order births
Male births/all births 157/304 209/431 243/454 259/501
Percentage boys 51.6 48.5 53.5 51.7
z 0.099 −1.191 0.923 0.151
Third order births
Male births/all births 55/117 98/170 99/167 57/133
Percentage boys 47.0 57.6 59.3 42.9
z −0.942 1.640* 2.048** −1.962
Fourth order births
Male births/all births 19/35 30/46 17/24 16/30
Percentage boys 54.3 65.2 70.8 53.3
z 0.346 1.880** 1.909** 0.216
  1. *: Significant at the 0.10 level.
  2. **: Significant at the 0.05 level.
  3. Since we consider testing of one-sided hypotheses, we do not report (two-sided) confidence intervals for the probability parameter.
  4. For fifth or higher birth orders, observations were few and no significant discrepancies were found.