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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.