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Table 2 Sample Demographic Characteristics

From: A multilevel non-hierarchical study of birth weight and socioeconomic status

Characteristic N %
Child Birth Weight (Mean ± SD) 3524.0 ± 466.4
Infant Gender   
   Male 1081 (50.4)
   Female 1063 (49.6)
Gestational Duration (Mean ± SD) 40.2 ± 2.1
   < 37 weeks 97 (4.5)
   37-41 weeks 1633 (76.2)
   > 41 weeks 395 (18.4)
   Missing 19 (0.9)
Birth Order   
   1 827 (38.6)
   2 766 (35.7)
   3+ 520 (24.3)
   Missing 31 (1.4)
Year of Birth   
   1969-1973 248 (11.6)
   1974-1978 695 (32.4)
   1979-1983 1201 (56.0)
Adequate Prenatal Care   
   Yes 1546 (72.1)
   No 212 (9.9)
   Missing 386 (18.0)
Inadequate Weight Gain   
   Yes 179 (8.3)
   No 1858 (86.7)
   Missing 107 (5.0)
Maternal Age (Mean ± SD) 27.5 ± 4.5
Maternal Race   
   White 2062 (96.2)
   Non-White 82 (3.8)
History of Diabetes   
   Yes 66 (3.1)
   No 2027 (94.5)
   Missing 51 (2.4)
History of Hypertension   
   Yes 159 (7.4)
   No 1930 (90.0)
   Missing 55 (2.6)
Cervical Incompetence   
   Yes 42 (2.0)
   No 2073 (96.6)
   Missing 29 (1.4)
Prior Low Birth Weight Infant   
   Yes 94 (4.4)
   No 2008 (93.7)
   Missing 42 (2.0)
Prior Preterm Infant   
   Yes 128 (6.0)
   No 1963 (97.5)
   Missing 53 (2.5)
Mother Smoked During Pregnancy   
   None 1526 (71.2)
   Average 1-10 cigarettes per day 289 (13.5)
   Average 11-20 cigarettes per day 206 (9.6)
   Average 20 + cigarettes per day 83 (3.9)
   Missing 40 (1.9)
Mother Consumed Alcohol During Pregnancy   
   None 1256 (58.6)
   During 1-2 trimesters 209 (9.8)
   During 3 trimesters 615 (28.7)
   Missing 64 (3.0)
Maternal Education   
   < HS Education 78 (3.6)
   HS Graduate 763 (35.6)
   Some College 1302 (60.7)
   Missing 1 (0.0)
Paternal Occupation   
   White collar 1054 (49.2)
   Blue collar 694 (32.4)
   Service occupations 359 (16.7)
   Missing 37 (1.7)