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Table 1 Characteristics of cohort at stratified by eligibility for analysis

From: Predicting who fails to meet the physical activity guideline in pregnancy: a prospective study of objectively recorded physical activity in a population-based multi-ethnic cohort

  Valid SWA data (eligible) Without valid SWA data (not eligible)  
(n = 555) (n = 268)
  n % n % P-value a
Ethnicity      <0.01
 South Asian 125 (22.5) 75 (28.0)  
 Middle Eastern 75 (13.5) 51 (19.0)  
 Other ethnicity 100 (18.0) 61 (22.8)  
 Western 255 (46.0) 81 (30.2)  
Occupation      0.20
 Elementary occupations and homemakers 150 (27.4) 86 (33.5)  
 Clerical/care occupations 196 (35.8) 86 (33.5)  
 Manager/° occupations 202 (36.8) 85 (33.0)  
 Missing 7   11   
Education      0.39
 <10 years 85 (15.4) 48 (18.2)  
 10–12 years 216 (39.0) 108 (40.9)  
 University or college 252 (45.6) 108 (40.9)  
 Missing 2   4   
Parity      0.11
None (nulliparous) 253 (45.6) 128 (47.8)  
 1 (uniparous) 201 (36.2) 79 (29.5)  
 ≥2 (multiparous) 101 (18.2) 61 (22.7)  
Smoking 3 months pre-pregnancy      0.96
 Non-smoker 455 (82.4) 218 (82.6)  
 Irregular or daily smoker 97 (17.6) 46 (17.4)  
 Missing 3   4   
Self-reported pre-pregnancy PA      0.16
 ≥150 min/wk 220 (40.6) 91 (35.4)  
 <150 min/wk 322 (59.4) 166 (64.6)  
 Missing 13   11   
Health pre-pregnancy      0.78
 Poor/not too good 58 (10.6) 30 (11.5)  
 Good 279 (50.7) 137 (52.3)  
 Very good 213 (38.7) 95 (36.2)  
 Missing 5   6   
Pelvic girdle-/lumbopelvic pain      0.87
 Yes 228 (41.8) 107 (41.2)  
 No 318 (58.2) 153 (58.8)  
 Missing 9   8   
  Mean SD Mean SD P-value b
Age (years) 30.1 (4.9) 29.3 (4.8) 0.02
BMI pre-pregnancy 24.4 (4.8) 25.0 (4.9) <0.01
Body fat percentage 33.1 (7.4) 34.5 (7.3) 0.15
  1. SD standard deviation, SWA Sensewear Armband, BMI body mass index
  2. a Chi-Square test
  3. b t-test