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Table 4 Additive interaction analysis of BMI and WC for HBP

From: Association of body mass index and waist circumference with high blood pressure in older adults

Characteristics Model 1 Model 2 Model 3
OR(95%CI) OR(95%CI) OR(95%CI)
Additive interaction models1
 BMI < 25 and WC < 88/102 1.000(ref) 1.000(ref) 1.000(ref)
 BMI ≥ 25 and WC < 88/102 1.459 (1.42,1.5) 1.546 (1.503,1.589) 1.517 (1.476,1.56)
 BMI < 25 and WC ≥ 88/102 1.377 (1.304,1.453) 1.286 (1.216,1.36) 1.301 (1.232,1.375)
 BMI ≥ 25 and WC ≥ 88/102 1.749 (1.699,1.799) 1.757 (1.705,1.811) 1.771 (1.719,1.823)
Additive interaction models2
 BMI < 25 and WC < 86/88 1.000(ref) 1.000(ref) 1.000(ref)
 BMI ≥ 25 and WC < 86/88 1.469 (1.412,1.528) 1.512 (1.453,1.574) 1.476 (1.418,1.536)
 BMI < 25 and WC ≥ 86/88 1.215 (1.172,1.26) 1.214 (1.171,1.259) 1.230 (1.186,1.275)
 BMI ≥ 25 and WC ≥ 86/88 1.662 (1.62,1.705) 1.727 (1.683,1.772) 1.729 (1.685,1.775)
  1. BMI body mass index, WC waist circumference. Model 1: unadjusted. Model 2: adjusted for sex and age. Model 3 adjusted for Model 2 and marital status, alcohol consumption, smoking, physical activity, place of residence, cancer, stroke, psychotic illness and blood glucose