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Table 1 Background characteristics of births, Nigeria, 1980–2013

From: Clustering of infant deaths among Nigerian women: investigation of temporal patterns using dynamic random effects model

Variables Birth cohorts
1980–1989
(n = 30,330)
1990–1999
(n = 74,211)
2000–2009
(n = 106,478)
≥ 2010
(n = 21,071)
Child-related variables
 Male sex 52.3 51.3 51.0 50.4
 Birth order
  1 32.8 23.7 20.3 19.9
  2–3 41.7 36.0 33.6 32.4
  4–5 18.2 22.2 23.2 23.1
  6+ 7.4 18.1 22.9 24.7
 Birth interval
  First born 32.8 23.7 20.3 19.9
  < 24 27.1 26.1 23.8 17.1
  24–36 28.5 30.5 31.9 33.2
  > 36 11.7 19.6 24.0 29.9
Maternal variables
 Age at child’s birth
  < 20 37.9 21.4 16.0 12.6
  20–34 61.9 73.5 69.5 70.3
  ≥ 35 0.2 5.1 14.5 17.1
 Education
  None 59.9 54.5 51.4 48.9
  Primary 24.8 24.7 22.5 18.6
  Secondary/higher 15.3 20.8 26.0 32.5
 Household wealth quintile
  Poorest 24.4 25.0 24.9 23.4
  Poorer 22.4 22.8 23.2 23.3
  Middle 21.0 20.3 19.1 18.9
  Richer 18.4 17.6 17.3 17.7
  Richest 13.8 14.4 15.5 16.7
 Religion
  Christianity 39.3 38.2 37.3 36.4
  Islam 46.3 51.0 58.1 62.1
  Others 14.4 10.8 4.6 1.5
 Type of place of residence
  Rural 31.1 30.8 31.4 34.6
  Urban 68.8 69.2 68.6 65.4
 Region
  North Central 16.6 17.5 17.5 17.3
  North East 34.5 35.1 35.9 37.5
  North West 12.0 13.2 13.6 13.7
  South East 10.4 9.4 8.6 8.9
  South South 14.4 11.7 10.7 9.4
  South West 12.0 13.1 13.8 13.2