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Table 2 Demographic and pre-pubertal predictors of earlier menarche in females

From: Early pubertal onset and its relationship with sexual risk taking, substance use and anti-social behaviour: a preliminary cross-sectional study

   Age at menarche (years) Total+
   Online (%) Paper (%)    
   n ≤ 12 ≥ 13 P n ≤ 12 ≥ 13 P AOR 95%CI P
Age at 16-24 years 345 44.3 39.7 0.179 495 84.6 86.3 0.559 ns   
survey ≥ 25 years 477 55.7 60.3   83 15.4 13.7     
Ethnicity white 792 95.8 97.3 0.243 547 93.8 95.4 0.387 ns   
  other 28 4.2 2.7   30 6.2 4.6     
Sexuality heterosexual 749 91.5 91.9 0.825 527 95.8 95.3 0.786 ns   
  lesbian/bisexual 68 8.5 8.1   25 4.2 4.7     
Number of ≤ 1 506 59.6 63.5 0.251 443 72.7 79.2 0.071 Ref   
childhood illnesses§ ≥ 2 316 40.4 36.5   135 27.3 20.8   1.87 (0.98-3.57) *
Overweight§ no 704 83.2 88.3 * 493 78.8 89.7 *** Ref   
  yes 117 16.8 11.7   84 21.2 10.3   1.89 (1.36-2.63) ***
Father at no 160 18.7 21.4 0.340 119 22.1 21.4 0.838 ns   
home§ yes 640 81.3 78.6   430 77.9 78.6     
Days off ≤ 10 672 78.0 86.7 0.712 479 73.5 84.3 0.144 ns   
school per year§ ≥ 11 142 22.0 13.3   91 26.5 15.7     
In poorest socio- no 501 61.2 66.8 0.105 415 75.2 79.8 0.213 Ref   
economic grouping yes 282 38.8 33.2   117 24.8 20.2   1.32 (1.03-1.71) *
  1. $ Socio-economic grouping is based on highest ranking parents. Lowest grouping includes those whose parents' occupation was semi-routine and routine and those who never worked or were long-term unemployed (see methods for more details). §Questions refer to childhood before menarche (see methods for more details). *<0.05, **<0.01, ***<0.001, ns = not significant. +Logistic regression analysis utilised all variables in table as well as data source (i.e. online or paper), AOR = Adjusted Odds Ratio, CI = Confidence Intervals.