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Table 1 Baseline characteristics of population-based sample and analysis sample

From: Changes in family income status and the development of overweight and obesity from 2 to 15 years: a longitudinal study

Income measure Population sample Analysis sample p-valuea
  n = 595 n = 517  
  % N % N  
Low-income at birth      0.50
  Yes 44 257 43 220  
  No 56 334 57 293  
  Missing   4   4  
Early-life risk factors      
Maternal overweight/obesity     0.57
  Yes 50 295 49 254  
  No 50 300 51 263  
Gestational weight gain      0.28
  Excessive 47 282 47 244  
  Inadequate 18 106 17 88  
  Within recommendations 35 207 36 185  
Smoking during pregnancy      0.89
  Yes 20 114 20 99  
  No 80 477 80 414  
  Missing   4   4  
Control Variables      
Multiparious      0.23
  Yes 41 243 42 216  
  No 49 352 48 301  
Age category      0.14
  18 to 25 years 26 153 27 140  
  25 years to 30 years 33 195 32 167  
  Older than 30 years 41 247 41 210  
Birthweight      0.17
  <3265 grams 26 157 25 128  
  ≥3930 grams 25 147 25 128  
  3265 - <3930 grams 49 291 50 261  
Sex      0.12
  Female 47 278 48 248  
  Male 53 317 52 269  
  1. aChi-squared analysis p-value comparing analysis sample and those not included (n = 68) from the population sample.