Table 4—

Age-adjusted association of the ponderal index at birth categorized into thirds with fasting serum insulin and blood glucose levels and insulin sensitivity, stratified by duration of vigorous LTPA

Ponderal index categoriesVigorous LTPA <25 min/week (n = 133)Vigorous LTPA ≥25 min/week (n = 134)
Fasting serum insulin levels (mU/l)
 <26.31 kg/m314.3 (12.1–16.5)10.5 (8.9–12.0)
 26.31–27.72 kg/m39.8 (7.6–12.0)10.3 (8.5–12.1)
 >27.72 kg/m310.4 (8.4–12.4)9.5 (7.8–11.2)
P value, lowest versus upper two thirds0.0020.56
P for the interaction between physical activity and thinness at birth0.033
Fasting blood glucose levels (mmol/l)
 <26.31 kg/m34.70 (4.54–4.85) mg/dl, 84.74.50 (4.37–4.63) mg/dl, 81.1
 26.31–27.72 kg/m34.54 (4.39–4.70) mg/dl, 81.84.45 (4.29–4.60) mg/dl, 81.2
 >27.72 kg/m34.51 (4.36–4.65) mg/dl, 81.34.54 (4.39–4.68) mg/dl, 81.8
P value, lowest versus upper two-thirds0.150.94
P for the interaction between physical activity and thinness at birth0.33
Insulin sensitivity index
 <26.31 kg/m30.474 (0.455–0.493)0.492 (0.476–0.507)
 26.31–27.72 kg/m30.496 (0.477–0.515)0.503 (0.484–0.521)
 >27.72 kg/m30.496 (0.479–0.513)0.504 (0.487–0.521)
P value, lowest versus upper two-thirds0.0490.22
P for the interaction between physical activity and thinness at birth0.50
  • Data are means (95% CI).