BMC Public Health 2008, 8:171 http://www.biomedcentral.com/1471-2458/8/171 Table 2: Univariate associations of possibly predictive variables with overweight Variables Sex Male Female Age group 5.0 – < 5.5 5.5 – < 6.0 6.0 – < 6.5 6.5 – < 7.0 7.0 – < 7.5 7.5 – < 8.0 Nationality German Other than German Study region East West Study location Urban Rural Parental educational level < 10 years of schooling 10 years of schooling > 10 years of schooling Living space <= 75 m2 > 75 m2 No. of persons in the child's living place Single child No Yes Attendance of day nursery No Yes Smoking in the living place No Yes Passive smoking during the first three years of life No Yes Smoking during pregnancy No Yes Breastfeeding for more than three months No Yes Preterm delivery No Yes Birth weight < 2500 g 2500 – < 3000 g 3000 – < 3500 g 3500 – < 4000 g > 4000 g Prevalence of overweight (%) 13.77 (N = 18,032) 17.25 (N = 17,402) 17.50 (N = 80) 14.53 (N = 8,498) 15.77 (N = 16,977) 15.92 (N = 9,265) 12.35 (N = 502) 18.75 (N = 112) 14.85 (N = 32,413) 22.61 (N = 2,733) 14.34 (N = 23,998) 17.87 (N = 11,436) 15.86 (N = 26,981) 14.26 (N = 8,453) 19.43 (N = 3,902) 16.29 (N = 15,233) 13.13 (N = 14,849) 16.74 (N = 17,213) 14.13 (N = 16,882) 14.42 (N = 23,148) 17.49 (N = 11,849) 15.87 (N = 14,718) 14.98 (N = 19,108) 14.14 (N = 18,266) 17.45 (N = 14,942) 14.74 (N = 11,084) 16.84 (N = 23,609) 15.04 (N = 29,833) 18.19 (N = 4,745) 15.79 (N = 22,634) 13.94 (N = 10,472) 15.63 (N = 32,313) 13.56 (N = 2,227) 9.77 (N = 2,006) 11.92 (N = 5,916) 14.12 (N = 13,340) 17.58 (N = 10,251) 24.09 (N = 3,296) *compared to educational level I (< 10 years of schooling) **compared to low birth weight (< 2500 g) ***Cochran-Armitage Trend Test P value < 0.0001 0.02 < 0.0001 0.0004 < 0.0001*** < 0.0001 < 0.0001 0.02 < 0.0001 < 0.0001 < 0.0001 < 0.0001 0.01 < 0.0001*** < 0.0001 Other than German vs German 1.68 (1.52 – 1.84) < 0.0001 *** Per unit increase in no. of persons: 0.91 (0.88–0.94) Odds Ratio [OR] Female vs Male 1.31 (1.23–1.38) Per unit increase in age group: 1.04 (1.00 – 1.08) Per unit increase in age: 1.12 (1.03 – 1.22) East vs West 0.77 (0.72–0.82) Urban vs Rural 1.13 (1.06–1.22) Per unit increase in educational level 0.79 (0.75–0.82) 0.81 (0.74–0.88)* 0.63 (0.57–0.69)* >75 m2 vs <= 75 m2 0.82 (0.77 – 0.87) Yes vs No: 1.26 (1.19 – 1.34) Yes vs No: 0.93 (0.88 – 0.99) Yes vs No: 1.28 (1.21–1.36) Yes vs No: 1.17 (1.10 – 1.25) Yes vs No: 1.26 (1.16 – 1.36) Yes vs No: 0.86 (0.81 – 0.92) Yes vs No: 0.85 (0.75 – 0.96) Per unit increase in birth weight category 1.31 (1.27 – 1.35) 1.25 (1.06 – 1.48)** 1.52 (1.30 – 1.77)** 1.97 (1.69 – 2.30)** 2.93 (2.48 – 3.47)** Page 5 of 10 (page number not for citation purposes)