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Table 1 Description of variables and measurements of the 6-year longitudinal health survey data in Huainan

From: Physical activity and chronic diseases among older people in a mid-size city in China: a longitudinal investigation of bipolar effects

Variable Names Code for this study Measurement in the dataset
Socio-demographic
 Age groups 0 = 55–59, 1 = 60–64, 2 = 65–69, 3 = 70–74, 4 = 75–79, 5 = 80–84, 6 = 85–89, 7 = 90–94 8 = 95–99 years Same
 Gender 0 = male, 1 = female Same
 Educational level 0 = none-to-primary school, 1 = middle school, 2 = high school, and 3 = college Same
 Self-rated income 0 = none-or-low income, 1 = high income Same
Physical Activity
 Levels 0 = no PA; 1 = irregular PA (not included in IPAQ categories); 2 = low PA (PA practice less than 599 MET-min/week); and 3 = moderate PA (PA practice between 600 and 3000 MET-min/week)a By frequency and lengthb.
  1. a The calculation of the metabolic equivalent (MET) minute of PA per week, based on which the annual repeated PA were categorized into four levels according to the International Physical Activity Questionnaire
  2. b Frequency: 0 = no activity, 1 = irregular activity, 2 = regular activity less than three times a week. Length: 0 = no activity; 1 = less than 20 min; 2 = 20 to 60 min; 3 = 60 min or greater