The LBW risk estimation associated with the prenatal care and educational level.

All the three models were adjusted for maternal age, gestational weight gain, BMI at the first pregnancy visit, gestational age, pregnancy-induced hypertension (missing 796), maternal job (missing 4672), and neonatal sex, prenatal care institutions (missing 745). The week of initiation of prenatal care, the number of prenatal care visits and maternal educational attainment (missing 611) were adjusted mutually.

Hosmer-Lemeshow goodness-of-fit test for each multiple regress model: ^a χ² = 22.99, P = 0.0034; ^b χ² = 22.65, P = 0.0038; ^c χ² = 20.84, P = 0.0076.

The LBW risk estimation associated with the prenatal care and educational level.