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Table 1 Body composition variables, weight status and parental socio-economic status in the study cohorts, by familial response behavior

From: Association between parental socioeconomic status with underweight and obesity in children from two Spanish birth cohorts: a changing relationship

  Birth cohort
  1999-2000 (n = 1158) 2007-2008 (n = 1588)
  Respondents SES Non-respondents SES Total Respondents SES Non-respondents SES Total
Boys, n (%) 253 (46.5) 334 (54.2) 587 (50.7) 715 (51.1) 91 (47.9) 806 (50.8)
Girls, n (%) 291 (53.5) 280 (45.5) 571 (49.3) 571 (48.9) 99 (52.1) 782 (49.2)
Age mean, years (range) 9.4 (8–11) 9.7 (8–11) 9.5 (8–11) 5.3 (4–7) 5.4 (4–7) 5.3 (4–7)
Body composition variables, mean (SD)
Weight (kg) 37.3 (9.3) 37.4 (9.1) 37.3 (9.2) 21.3 (4.7) 21.7 (5.0) 21.4 (4.8)
Height (cm) 139.6 (7.2) 139.5 (6.8) 139.6 (7.0) 115.4 (6.1) 115.7 (5.8) 115.5 (6.1)
BMI (kg/m2) 19.0 (3.7) 19.0 (3.7) 19.0 (3.7) 15.9 (2.4) 16.0 (2.6) 15.9 (2.5)
BF% 25.4 (6.6) 25.2 (6.9) 25.3 (6.8) 20.1 (5.8) 20.5 (6.2) 20.2 (5.8)
Weight status categories, % (95 % CI)
Underweight 7.5 (5.2-9.8) 8.6 (6.3-10.9) 8.1 (6.5-9.7) 20.5 (18.4-22.7) 20.5 (14.5-26.5) 20.5 (18.5-22.5)
Normal weight 57.4 (53.1-61.6) 55.4 (51.5-59.5) 56.4 (53.5-59.3) 59.2 (56.5-61.8) 57.9 (50.6-65.2) 59.0 (56.5-61.4)
Overweight 25.9 (22.1-29.7) 25.0 (21.6-28.6) 25.5 (22.9-28.0) 12.0 (10.3-13.7) 10.5 (5.9-15.1) 11.8 (10.2-13.4)
Obesity 9.2 (6.7-11.7) 10.7 (8.2-13.3) 10.0 (8.2-11.8) 8.3 (6.8-9.8) 11.1 (6.3-15.8) 8.6 (7.2-10.0)
Overweight/obesity 35.1 (31.0-39.2) 35.7 (31.9-39.7) 35.5 (32.7-38.3) 20.3 (18.2-22.5) 21.6 (15.5-27.7) 20.4 (18.4-22.5)
Parental socio-economic status, % (95 % CI)
  N = 544 N = 1398
Lower 1.6 (0.5-2.9) 3.5 (2.5-4.5)
Lower middle 18.9 (15.5-22.3) 27.3 (24.9-29.7)
Middle 38.2 (34.1-42.4) 44.8 (42.2-47.5)
Upper middle 31.8 (27.8-35.8) 19.9 (17.8-22.1)
Upper 9.4 (6.8-11.9) 4.4 (3.2-5.5)
  1. Abbreviations: BMI body mass index, BF% body fat percentage, SD Standard deviation, CI confidence interval