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Table 1 The distribution of LBW determinants (total and LBW statistics)

From: Correlates of low birth weight in term pregnancies: a retrospective study from Iran

  Total LBW cases
  Number (%) Number (%)
Maternal age (at child birth) (n = 3720) (n = 182)
≤20 631 (17.0) 39 (21.4)
21–34 2817 (75.7) 129 (70.9)
≥35 272 (7.3) 14 (7.7)
Mean (SD) 25.7 (5.3) 24.8 (5.6)
Maternal education (n = 3726) (n = 181)
Illiterate & primary 1350 (36.2) 64 (35.4)
Secondary & high school 2215 (59.5) 115 (63.5)
University 161 (4.3) 2 (1.1)
Number of parities (n = 3734) (n = 175)
none 4 (0.1) 1 (0.6)
1 1666 (45.7) 85 (48.6)
2 1127 (31.0) 49 (28.0)
≥3 844 (23.2) 40 (22.8)
Mean (SD) 1.91 (SD = 1.15) 1.90 (1.21)
History of LBW deliveries (n = 3731) (n = 182)
No 3578 (95.9) 169 (92.9)
Yes 153 (4.1) 13 (7.1)
History of pre term labor (n = 3722) (n = 182)
No 3582 (96.2) 173 (95.1)
Yes 140 (3.8) 9 (4.9)
Cigarette smoking (n = 3731) (n = 181)
No 3686 (98.8) 174 (96.1)
Yes 45 (1.2) 7 (3.9)
Chronic diseases (n = 3733) (n = 182)
None 3380 (90.5) 148 (81.3)
Hypertension 188 (5.0) 22 (12.1)
Others 165 (4.5) 12 (6.6)
Residence (n = 3716) (n = 181)
Tehran 2504 (67.4) 109 (60.2)
Suburbs of Tehran 1212 (32.6) 72 (39.8)