Table 1

Subject characteristics across physical fitness tertiles (N=1002) (mean±SD)

Physical fitness tertiles
Low (N=341)Medium (N=311)High (N=350)p Value
Age (years)45.0±14.345.3±16.047.4±18.40.111
Body mass index (BMI) (kg/m2)29.7±6.526.3±4.8*24.5±3.8*<0.001
Education (total years)14.9±3.715.9±2.6*16.0±2.7*<0.001
Smoking habit (% in tertile)14.1%9.6%5.7%0.001
Sex (% in tertile)
 Males27.3%43.1%48.0%<0.001
 Females72.7%56.9%52.0%
Marital status (% in tertile)
 Married59.2%58.2%53.7%0.058
 Single24.9%31.8%31.7%
 Other15.8%10.0%14.6%
Stress level (% in tertile)
 Low26.4%38.9%45.1%<0.001
 Medium51.6%49.8%45.4%
 High22.0%11.3%9.4%
Exercise frequency (% in tertile)
 <1 day/week44.9%15.1%4.3%<0.001
 1–4 days/week49.3%70.4%53.1%
 ≥5 days/week5.9%14.5%42.6%
Exercise habits, duration (% in tertile)
 <1 year or no Exercise66.3%24.4%9.4%<0.001
 1–5 years14.4%18.0%11.1%
 ≥5 years19.4%57.5%79.4%
Fruit intake (% in tertile)
 ≤1 serving/day34.9%26.7%20.6%<0.001
 2 serving/day34.9%41.5%34.3%
 ≥3 serving/day30.2%31.8%45.1%
  • p-Values for age, BMI and education are from a one-way analysis of variance analysis (with ‘*’ denoting p<0.05 vs the low tertile), and for all other variables from a χ2 analysis.