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Table 1 Sociodemographic characteristics of the study population (N = 830) according to categories of self-reported nightly sleep duration during early pregnancy

From: Sleep duration and plasma leptin concentrations in early pregnancy among lean and overweight/obese women: a cross sectional study

  Categories of hours of sleep during pregnancy
  ≤ 5 hours 6 hour 7-8 hours ≥9 hours
Characteristics N = 28 N = 44 N = 485 N = 273
Maternal age (years) 29.6 ± 5.6 31.4 ± 4.1 32.0 ± 4.5 31.6 ± 4.6
 18-25 6 (21.4) 3 (6.8) 23 (4.7) 9 (3.3)
 25-34 16 (57.1) 33 (75.0) 331 (68.3) 193 (70.7)
 ≥ 35 6 (21.4) 8 (18.2) 131 (27.0) 71 (26.0)
Maternal race/Ethnicity     
 Non-Hispanic White 26 (92.9) 37 (84.1) 417 (86.0) 236 (86.5)
 African American 0 (0.0) 3 (6.8) 10 (2.0) 3 (1.1)
 Other 2 (7.1) 4 (9.1) 58 (12.0) 34 (12.4)
Payment status     
 Insurance 21 (75.0) 37 (84.1) 432 (89.1) 245 (89.7)
 Medicaid 4 (14.3) 3 (6.8) 9 (1.8) 10 (3.7)
 Missing 3 (10.7) 4 (9.1) 44 (9.1) 18 (6.6)
Nulliparous 23 (82.1) 34 (77.3) 408 (84.1) 252 (92.3)
Not married 11 (39.3) 6 (13.6) 54 (11.1) 27 (9.9)
< 12 years of education 3 (10.7) 1 (2.3) 27 (5.6) 10 (3.7)
Smoked during pregnancy 3 (10.7) 2 (4.6) 30 (6.2) 19 (7.0)
Physically inactive during pregnancy 8 (28.6) 5 (11.4) 81 (16.7) 46 (16.9)
Pre-pregnancy BMI 23.0 ± 4.8 22.3 ± 4.0 23.2 ± 4.8 23.7 ± 5.3
(kg/m2)
 < 18.5 2 (7.1) 4 (9.1) 20 (4.1) 9 (3.3)
 18.5 – 24.9 21 (75.0) 30 (68.2) 359 (74.0) 196 (71.8)
 25-29.9 2 (7.1) 8 (18.2) 68 (14.0) 44 (16.1)
 ≥ 30.0 3 (10.7) 2 (4.5) 38 (7.9) 24 (8.8)
Mean systolic blood pressure in first trimester (mmHg) 114.2 ± 10.4 114.3 ± 9.4 112.5 ± 10.0 112.6 ± 10.2
Mean diastolic blood pressure in first trimester (mmHg) 69.2 ± 6.3 69.2 ± 7.0 70.3 ± 7.2 69.8 ± 7.0
Mean arterial blood pressure in first trimester (mmHg) 84.2 ± 6.9 84.2 ± 7.0 84.4 ± 7.3 84.1 ± 7.2
Gestational age at blood collection (weeks) 12.9 ± 3.0 14.5 ± 3.3 13.7 ± 3.5 13.6 ± 3.2
  1. Data presented as mean ± SD or number (%).