Table 3.

Association between BMI category and incident kidney stones in multivariate-adjusted analyses

BMIaHRa (95% CI)P Value
<18.5 kg/m2 (underweight)0.79 (0.47 to 1.32)
18.5–24.9 kg/m2 (normal weight)Reference
25–29.9 kg/m2 (overweight)1.30 (1.17 to 1.44)
30–34.9 kg/m2 (moderately obese)1.62 (1.43 to 1.83)
≥35 kg/m2 (severely obese)1.81 (1.57 to 2.10)
  • This model does not include physical activity or calibrated dietary energy intake.

  • a Adjusted for age (continuous); race (category); history of diabetes; use of calcium supplement; hormone replacement therapy (category); income (dichotomized); region (category); and quintile intake of water, sodium, animal protein, and dietary calcium.