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Table 1 Baseline characteristics of analytic and excluded samples

From: The impact of physical activity on healthy ageing trajectories: evidence from eight cohort studies

   Analytic sample (N = 130,521) Excluded sample (N = 78,279) t / χ2 Effect size
Age, M (SD)   62.80 (10.06) 62.31 (11.68) 10.29*** 0.05
Gender, N (%) Female 72,312 (55.40) 40,632 (51.91) 0.32 0.001
Male 58,063 (44.49) 32,453 (41.46)
Missing 146 (0.11) 5194 (6.64)
Wealth, N (%) 1st quintile 26,406 (20.23) 13,702 (17.50) 266.04*** 0.04
2nd quintile 25,419 (19.48) 13,064 (16.69)
3rd quintile 24,760 (18.97) 13,663 (17.45)
4th quintile 24,040 (18.42) 14,162 (18.09)
5th quintile 23,657 (18.13) 14,892 (19.02)
Missing 6239 (4.78) 8796 (11.24)
Education, N (%) Less than primary/primary 43,469 (33.3) 22,181 (28.34) 488.55*** 0.05
Secondary 62,821 (48.13) 38,425 (49.09)
Tertiary 21,834 (16.73) 14,666 (18.74)
Missing 2397 (1.84) 3007 (3.84)
Study, N (%) ALSA 1843 (1.41) 244 (0.31) 27,000*** 0.36
ELSA 14,483 (11.1) 4006 (5.12)
ENRICA 2513 (1.93) 6 (0.01)
HRS 32,934 (25.23) 4382 (5.60)
JSTAR 3695 (2.83) 3573 (4.56)
KLOSA 8928 (6.84) 1326 (1.69)
MHAS 12,647 (9.69) 8719 (11.14)
SHARE 53,478 (40.97) 56,023 (71.57)
Health score, M (SD)   70.21 (16.46) 70.38 (17.81) −2.05* −0.0004
Physical activity (aggregated), N (%) No 49,622 (38.02) 21,999 (28.10) 1300*** 0.08
Yes 80,001 (61.29) 50,555 (64.58)
Missing 1397 (0.69) 5725 (7.31)
Frequency of vigorous physical activity, N (%) Never 42,244 (32.37) 26,326 (33.63) 3300*** 0.15
Once per week 20,738 (15.89) 12,865 (16.43)
2/3 per week 7129 (5.46) 882 (1.13)
4+ per week 23,789 (18.23) 19,278 (24.63)
Missing 36,621 (28.06) 18,928 (24.18)
Frequency of less vigorous physical activity, N (%) Never 11,751 (9.00) 8371 (10.69) 5100*** 0.19
Once per week 16,840 (12.90) 11,984 (15.31)
2/3 per week 10,311 (7.90) 1145 (1.46)
4+ per week 44,556 (34.14) 36,324 (46.40)
Missing 47,063 (36.06) 20,455 (26.13)
Ever smoker*, N (%) No 62,168 (47.63) 40,439 (51.66) 487.34*** 0.05
Yes 66,817 (51.19) 35,508 (45.36)
Missing 1536 (1.18) 2332 (2.98)
Ever drinker*, N (%) No 39,019 (29.89) 29,797 (38.07) 1800*** 0.09
Yes 91,023 (69.74) 46,260 (59.10)
Missing 479 (0.37) 2222 (2.84)
  1. Note. All variables correspond to participants’ baseline, except for ever drinker and ever smoker, which correspond to the whole period of participation. Effect size estimates for age and health score correspond to Cohen’s d; the remaining effect size estimates correspond to Cramer’s V, and have been computed with non-missing data only. M: mean, SD: standard deviation, N: number of cases, t: Student’s t test; χ2: chi-square test. *: p < .05; ***: p < .001