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Table 1 Child and family characteristics

From: Birth order is associated with caries development in young children: a register-based cohort study

 n%
Gender
 Boy33,42351.2
 Girl31,83648.8
Birth order
 First-born30,52446.8
 Second-born23,48836.0
 Third-born825012.6
 Fourth-born20633.2
 Fifth- or later-born9341.4
Maternal country of birth
 Sweden50,11076.8
 Abroad15,14623.2
Paternal country of birth
 Sweden49,04275.5
 Abroad15,90924.5
Maternal education
  ≤ 9 years55938.6
 10–12 years25,60339.2
  ≥ 13 years34,06352.2
Family situation
 Cohabiting62,29895.5
 Single29614.5
Family income
 First quintile (highest income)13,42720.7
 Second quintile13,30320.5
 Third quintile13,20420.3
 Fourth quintile12,81019.7
 Fifth quintile (lowest income)12,16818.7
Social welfare allowance
 No63,05197.1
 Yes18612.9
Maternal smoking in early pregnancy
 No55,35284.8
 Daily36165.6
 Missing62919.6
Maternal BMI in early pregnancy
  < 25.0045,49069.7
 25.0029.9910,47416.0
  ≥ 30.0037895.8
 Missing55068.5
Maternal age at delivery
 25–34 years43,13866.1
  < 25 years656110.1
  ≥ 35 years15,56023.8