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Table 1 The numbers of nurses who underwent health screening and follow-up each year

From: Effects of shift work on abdominal obesity among 20–39-year-old female nurses: a 5-year retrospective longitudinal study

  Number (%)
  Total a Day workers b Shift workers c
Health screening year
 2010 632 (100.0) 244 (38.6) 388 (61.4)
 2011 667 (100.0) 245 (36.7) 422 (63.3)
 2012 678 (100.0) 255 (37.6) 423 (62.4)
 2013 655 (100.0) 243 (37.1) 412 (62.9)
 2014 669 (100.0) 225 (33.6) 444 (66.4)
 2015 540 (100.0) 203 (37.6) 337 (62.4)
Follow-up period
 Baseline d 934 (100.0) 309 (33.1) 625 (66.9)
 1-year follow-up 897 (100.0) 296 (33.0) 601 (67.0)
 2-year follow-up 716 (100.0) 270 (37.7) 446 (62.3)
 3-year follow-up 561 (100.0) 223 (39.8) 338 (60.2)
 4-year follow-up 440 (100.0) 177 (40.2) 263 (59.8)
 5-year follow-up 333 (100.0) 140 (42.0) 193 (58.0)
  1. a total was defined as all study population (shift workers and day workers)
  2. b day workers were defined as the numbers of nurses who did not include into shift workers
  3. c shift workers were defined as the numbers of nurses who had at least four night shifts per month, or >60 night hours per month during the previous 6 months
  4. d Baseline was defined as the year when each subject was enrolled. Each subject may have different baselines according to her enrollment year