Table 1.

Number of prenatal care visits according to adequacy of prenatal care use and gestational age at initiation of prenatal care, Aracaju, Brazil, 2005.

Variable	Mean	SD	Median	IQR	n
Adequacy of prenatal care use
Absent	0	0	0	0	75
Inadequate*	4.62	1.78	5	3	1216
Intermediate	3.69	0.47	4	1	245
Adequate	5.58	0.56	6	1	1103
Intensive	8.22	1.48	8	2	1909
Gestational age at initiation of prenatal care (weeks)
< 16	6.56	2.20	6	3	3937
≥ 16	4.13	1.78	4	2	611
Total	6.24	2.30	6	3	4548

SD – standard deviation; IQR – interquartile range

* Four mothers were classified as having inadequate prenatal care use because care started ≥ 16 weeks had missing values on the number of visits.