TABLE 2. Effect of chronic hypertension on the risk of small-for-gestational age birth by age categories, stratified and logistic regression analyses (n = 1,938), France, 1991-1993 Small-for-gestational age birth Chronic Crude Adjusted Age category 95% CI* 95% CI hypertension OR* ORt <25 No (n = 526) 1.0 Referent 1.0 Referent Yes (n = 18) 0.5 0.0-3.6 1.5 0.2-13.5 26-30 No (n = 628) 1.0 Referent 1.0 Referent Yes (n = 28) 2.2 0.5-6.8 4.2 1.3-13.3 >30 No (n = 591) 1.0 Referent 1.0 Referent Yes (n = 34) 3.6 1.1-9.7 8.5 2.9-24.5 *OR, odds ratio; CI, confidence interval. + Adjusted for parity, smoking, ducational level, ethnic group of origin, and mother's height and weight at initial visit.