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Table 1 Characteristics of the baseline sample and the distribution of PI

From: Level of physical activity among middle-aged and older Chinese people: evidence from the China health and retirement longitudinal study

Variables Number of total participants Number of physically inactive participants Prevalence of PI χ2 p value
Age     91.474 < 0.001
 45–59 2323 371 16.0%   
 60–74 1821 357 20.0%   
  ≥ 75 381 140 36.8%   
Gender     8.264 < 0.001
 Male 2085 362 17.4%   
 Female 2440 506 20.7%   
Spouse     8.968 < 0.001
 Yes 3820 704 18.4%   
 No 705 164 23.3%   
Living area     25.910 < 0.001
 Urban 1648 381 23.1%   
 Rural 2877 487 16.9%   
BMI level     25.227 < 0.001
 Underweight 300 72 24.0%   
 Normal 1888 308 16.3%   
 Overweight 1720 338 19.7%   
 Obese 617 150 24.3%   
Work status     332.581 < 0.001
 Currently working 3179 389 12.2%   
 Not working 1346 479 35.6%   
Education level     4.165 0.24
 Illiteracy 1242 256 20.6%   
 Elementary school 1846 330 17.9%   
 Middle/high school 1360 265 19.5%   
 College or above 77 17 22.1%   
PCE level     4.750 0.31
 1/5 935 200 21.4%   
 2/5 940 171 18.2%   
 3/5 904 163 18.0%   
 4/5 923 182 19.7%   
 5/5 823 152 18.5%   
Smoking     7.114 0.03
 Never 2796 562 20.1%   
 Quit 368 77 20.9%   
 Yes 1361 229 16.8%   
Drinking     13.888 < 0.001
 Never 3040 629 20.7%   
  < Once a month 339 58 17.1%   
  > Once a month 1146 181 15.8%   
Non-communicable diseasesa     0.487 0.49
 Yes 3083 600 19.5%   
 No 1442 268 18.6%   
ADL/IADL disability     49.277 < 0.001
 Yes 1241 321 25.9%   
 No 3284 547 16.7%   
Number of public facilities 3.44 ± 3.39 / / / /
  1. Categorical data was presented by frequency (n%), quantitative data was presented by mean value and standard deviation. Weighting was conducted using individual level weights with non-response adjustment released by the CHARLS. χ2: results of Chi-square tests. aParticipants who have been diagnosed of having at least one of the diseases listed in Measurement section were categorized into “yes”