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Table 2 Study sample characteristics

From: Low-level prenatal lead exposure and infant sensory function

  Infants with Newborn ABR Data Infants with 6-Wk Grating VA Data
Variable N Median
(5th, 95th percentile)
N Median
(5th, 95th percentile)
Gestational age (wks) at mid-pregnancy visit 353 15.0 (13.0, 19.0) 1054 15.0 (13.0, 19.0)
Gestational age (wks) at late-pregnancy visit 352 39.0 (37.0, 41.0) 1054 39.4 (36.9, 41.3)
Gestational age (wks) at birth 353 39.0 (37.0, 41.0) 1058 39.7 (37.9, 41.4)
Birth weight (g) 361 3400 (2850, 4100) 1054 3400 (2750, 4000)
Head circ. (cm) 361 34.1 (31.9, 36.0) 1030 34.1 (32.0, 36.0)
Age at testing (days) 362 2.2 (1, 4) 1058 43 (41, 89)
   N (%)   N (%)
Sex (male) 350 183 (52.3) 1053 555 (52.5)
Low cord ferritin 360 99 (27.5) 1055 298 (28.3)