Table 2. The odds ratios of high blood pressure at age of 7 years with different concentrations of total serum bilirubin at 48h after birth.

	Total serum bilirubin	High blood pressure at 7 years old
		n/N (%)	Model 1		Model 2		Model 3
			OR	95% CI	OR	95% CI	OR	95% CI
Preterm Infants	< 3mg/dl	55/613 (9.0)	1		1		1
	≥ 3mg/dl, < 6mg/dl	148/1270 (11.7)	1.34	0.97, 1.85	1.36	0.98, 1.89	1.36	0.98, 1.91
	≥ 6mg/dl, < 9mg/dl	202/1711 (11.8)	1.36	0.99, 1.86	1.35	0.98, 1.85	1.36	0.99, 1.86
	≥ 9mg/dl, < 12mg/dl	136/951 (14.3)	1.69	1.22, 2.36	1.55	1.10, 2.19	1.54	1.09, 2.21
	≥ 12mg/dl	169/1180 (14.3)	1.70	1.23, 2.34	1.42	1.01, 2.00	1.42	1.00, 2.02
Term Infants	< 3mg/dl	744/6452 (11.5)	1		1		1
	≥ 3mg/dl, < 6mg/dl	1197/10510 (11.4)	0.99	0.90, 1.09	1.00	0.91, 1.11	1.01	0.91, 1.12
	≥ 6mg/dl, < 9mg/dl	1005/9248 (10.9)	0.94	0.85, 1.03	0.97	0.88, 1.08	0.96	0.85, 1.07
	≥ 9mg/dl, < 12mg/dl	392/3315 (11.8)	1.03	0.90, 1.17	1.07	0.93, 1.22	1.07	0.91, 1.25
	≥ 12mg/dl	226/2294 (11.6)	1.01	0.87, 1.17	1.02	0.88, 1.19	1.00	0.85, 1.24

Model 1: crude odds ratios; Model 2: Adjusted for race (white, black, and other race), sex (male and female), birth weight (< 2500g, 2500g–4000g and ≥4000g), gestational age (as a categorical variable), transfusion (yes and no), hypertensive disorders during pregnancy (none, moderate, and severe), maternal smoking (0, 1–19 and 20 cigarette per day during pregnancy) and socioeconomic status (comprised of 5 categories as assessed by the original CPP investigators); Model 3: adjusted for the same factors as model 2 in Generalized Estimating Equation mode