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Table 1 The characteristics of the included participants

From: Validity and reliability of a food frequency questionnaire for assessing dietary intake among Shanghai residents

Characteristics Men Women All
  n % of Sub-group  n % of Sub-group n % of Sub-group
Age group (years)
 15–44 230 28.8 233 28.2 463 28.5
 45–59 279 35.0 298 36.1 576 35.5
  ≥ 60 289 36.2 294 35.7 583 35.9
Marital Status
 Married 653 81.8 639 77.5 1291 79.6
 Other marital status 145 18.2 185 22.5 330 20.4
Occupation
 Professional job 198 24.8 126 15.3 324 20.0
 Labor job 101 12.7 76 9.3 178 10.9
 0Others 499 62.5 621 75.4 1120 69.1
Years of education
 ≤ 6 years 165 20.7 219 26.6 384 23.7
 7–9 years 248 31.0 261 31.7 509 31.4
 10–12 years 205 25.7 189 22.9 394 24.3
 > 12 years 180 22.6 155 18.8 335 20.7
Weight Status
 Underweight 18 2.2 30 3.6 48 2.9
 Normal 304 38.1 368 44.6 671 41.4
 Overweight 285 35.7 205 24.9 490 30.2
 Obese 63 7.8 38 4.6 100 6.2
 Non-reported 129 16.1 184 22.3 313 19.3
Smoker
 No 370 46.4 819 99.4 1189 73.3
 Yes 428 53.6 5 0.6 433 26.7
Drinker
 No 474 59.4 756 91.8 1230 75.9
 Yes 269 33.7 43 5.2 311 19.2
 Non-reported 55 6.9 25 3.0 80 4.9
Family Income
  < 20,000 RMB/person 38 4.7 50 6.1 88 5.4
 20,000–50,000 RMB/person 249 31.2 258 31.3 506 31.2
  > 50,000 RMB/person 193 24.1 213 25.8 405 25.0
 Non-reported 319 40.0 304 36.9 623 38.4
Region
 Urban 363 45.5 388 47.0 750 46.3
 Suburban 200 25.1 209 25.3 409 25.2
 Rural 235 29.5 228 27.6 463 28.5