Table 1 Age and anthropometry in first-born and second-born men. Age data are mean ± SD; other data are means and 95% confidence intervals adjusted for other confounding factors in the multivariate models

From: Among overweight middle-aged men, first-borns have lower insulin sensitivity than second-borns

  First-borns Second-borns p-value
n 26 24  
Ethnicity (European descent) 92% 92% 0.99
Age (years) 44.9 ± 5.6 46.4 ± 5.4 0.37
Height (cm) 176.8 (171.0–180.5) 175.1 (169.7–180.5) 0.40
Weight (kg) 91.0 (83.6–98.4) 84.1 (76.9–91.3) 0.013
BMI (kg/m2) 29.1 (27.7–30.5) 27.5 (26.1–28.9) 0.004
Total body fat (%) 32.2 (27.3–37.1) 29.9 (25.1–34.7) 0.21
Android fat to gynoid fat ratio 1.27 (1.13–1.41) 1.23 (1.09–1.36) 0.42
Fat mass index (kg/m2) 9.36 (7.74–10.97) 8.26 (6.69–9.84) 0.068