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Table 1 Demographic Characteristics of Low-Income Overweight or Obese Postpartum Women

From: Sleep and weight loss in low-income overweight or obese postpartum women

Characteristics Mean ± SD or N (%) P-value$
T1 (N = 569) T2 (N = 367) T3 (N = 332)
Age (years) 28.54 ± 5.03 29.17 ± 4.91 29.42 ± 4.86 1.00
Postpartum period (years) 1.72 ± 1.28 1.73 ± 1.27 1.74 ± 1.28 0.98
Race
 Black 121 (21.27) 68 (18.53) 63 (18.98) 0.53
 White 448 (78.73) 299 (81.47) 269 (81.02)  
Education
 High School or less 187 (32.86) 116 (31.61) 102 (30.72) 0.80
 At least some college 382 (67.14) 251 (68.39) 230 (69.28)  
Employment
 Employed (FT/PT/Self) 262 (46.05) 161 (43.87) 139 (41.87) 0.66
 Unemployed 118 (20.74) 66 (17.98) 61 (18.37)  
 Other (homemaker/student/other) 189 (33.22) 140 (38.15) 132 (39.76)  
Current smoker
 No 421 (73.99) 296 (80.65) 260 (78.31) 0.12
 Yes 148 (26.01) 71 (19.35) 72 (21.69)  
Current breastfeeding
 No 475 (83.48) 290 (79.02) 267 (80.42) 0.76
 Yes 94 (16.52) 77 (20.98) 65 (19.58)  
 Body mass index (BMI) 32.04 ± 4.29 31.77 ± 4.35 31.60 ± 4.30 1.00
BMI category
 Overweight (BMI 25–29.9 kg/m2) 205 (36.03) 142 (38.69) 131 (39.46) 0.83
 Obese I (BMI 30–34.9 kg/m2) 209 (36.73) 131 (35.69) 122 (36.75)  
 Obese II (BMI 35.0–39.9 kg/m2) 155 (27.24) 94 (25.61) 79 (23.80)  
Randomization
 Intervention group 387 (68.01) 236 (64.31) 213 (64.16) 0.80
 Comparison group 182 (31.99) 131 (35.69) 119 (35.84)  
  1. T1: baseline, T2: 4 months from T1, T3: 7 months from T1. FT: employed full-time, PT: employed part-time, self = self-employed
  2. $P-values were derived using mixed-effects linear regression modeling for continuous variables (age, postpartum period, BMI) and mixed-effects logistic regression for categorical variables (race, education, employment, current smoker, current breastfeeding, BMI category, and randomization). We did not present coefficient or odds ratio estimates from the regression models since the descriptive statistics (Mean ± SD and %) in the table are more straightforward to illustrate the extent of change across time