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Table 2 Characteristics of the 3212 participants and their age-adjusted median scores (Interquartile ranges) of physical performance by gender from quantile regression models

From: Education-related differences in physical performance after age 60: a cross-sectional study assessing variation by age, gender and occupation

  Men (n = 1164) Women (n = 2048)
  n Grip strength* (Newton) Balance score (0–60 sec) Chair stands (/minute) Walking speed (m/s) n Grip strength† (Newton) Balance score (0–60 sec) Chair stands (/minute) Walking speed (m/s)
Age groups
60-66 566 397 (343–450) 60 (29–60) 30 (21–38) 1.2 (1.2-1.5) 728 225 (184–261) 60 (23–60) 27 (21–33) 1.2 (1.2-1.5)
72-78 338 331 (279–383) 14 (5–47) 21 (17–27) 1.2 (0.8-1.2) 579 179 (142–210) 11 (4–34) 20 (12–25) 1.0 (0.8-1.2)
81-87 179 276 (227–329) 3 (0–10) 17 (0–23) 0.8 (0.5-1.2) 411 153 (125–177) 3 (0–7) 9 (0–20) 0.6 (0.4-1.0)
90+ 81 266 (224–308) 0 (0–3) 0 (0–9) 0.5 (0.3-0.8) 330 145 (122–166) 0 (0–0) 0 (0–3) 0.3 (0.0-0.5)
Education
Elementary school 164 316 (266–364) 19 (8–30) 16 (9–22) 0.9 (0.7-1.2) 389 172 (135–196) 18 (6–25) 13 (8–17) 0.8 (0.5-1.0)
High school 487 318 (267–368) 19 (8–30) 16 (9–24) 0.9 (0.7-1.2) 1098 173 (143–201) 18 (6–25) 13 (8–20) 0.8 (0.6-1.1)
University 513 318 (270–366) 21 (11–30) 18 (11–26) 1.0 (0.7-1.2) 561 185 (155–214) 19 (9–25) 16 (10–23) 1.0 (0.8-1.1)
Occupational class
Manual workers 204 317 (265–363) 19 (7–30) 15 (8–20) 0.9 (0.6-1.2) 564 176 (144–202) 18 (6–25) 11 (8–19) 0.8 (0.5-1.0)
Non-manual workers 960 318 (269–367) 19 (8–30) 18 (10–25) 0.9 (0.8-1.2) 1484 176 (142–204) 18 (7–25) 15 (8–21) 0.8 (0.7-1.0)
Chronic diseases
0-1 diseases 630 330 (273–374) 22 (10–34) 18 (12–26) 1.0 (0.8-1.2) 926 181 (153–208) 19 (7–25) 16 (9–23) 0.9 (0.7-1.1)
2+ diseases 531 313 (266–360) 17 (8–24) 15 (9–23) 0.8 (0.6-1.2) 1116 172 (137–201) 17 (7–25) 12 (8–19) 0.8 (0.5-1.0)
Physical exercise
Inactive 334 308 (261–350) 16 (7–30) 13 (6–19) 0.7 (0.5-1.0) 710 171 (139–199) 16 (6–23) 8 (7–14) 0.6 (0.4-0.8)
Health-enhancing 536 320 (271–378) 22 (9–30) 18 (13–24) 1.0 (0.9-1.2) 974 179 (143–206) 20 (6–26) 18 (10–22) 0.9 (0.8-1.1)
Fitness-enhancing 294 331 (278–377) 22 (12–30) 22 (15–26) 1.1 (0.9-1.2) 364 182 (155–211) 20 (11–26) 21 (15–26) 1.0 (0.8-1.1)
Body mass index (kg/m2)
<20 48 309 (268–346) 20 (9–30) 16 (9–19) 0.8 (0.6-1.0) 146 177 (143–199) 19 (15–24) 14 (9–21) 0.8 (0.6-1.0)
20-24.99 401 313 (267–359) 20 (9–30) 18 (9–26) 1.0 (0.8-1.2) 816 177 (145–205) 19 (8–26) 16 (9–25) 0.9 (0.7-1.1)
25-29.99 534 326 (276–374) 20 (9–30) 18 (11–26) 1.0 (0.8-1.2) 652 174 (145–203) 19 (7–26) 14 (9–23) 0.8 (0.7-1.1)
≥30 154 321 (260–379) 15 (3–30) 15 (8–22) 0.9 (0.6-1.2) 234 170 (135–202) 15 (4–26) 14 (7–21) 0.8 (0.5-1.0)
Smoking
Never 406 319 (269–368) 19 (9–30) 17 (10–26) 1.0 (0.7-1.2) 1096 174 (141–202) 18 (7–25) 15 (9–21) 0.8 (0.6-1.1)
Former 577 317 (266–367) 19 (9–30) 17 (10–23) 0.9 (0.7-1.2) 647 177 (145–204) 18 (7–25) 12 (8–21) 0.8 (0.6-1.1)
Current 174 317 (274–358) 19 (7–30) 17 (10–22) 0.9 (0.7-1.2) 279 178 (150–206) 18 (4–25) 13 (8–21) 0.8 (0.6-1.1)
Alcohol consumption
No or occasional 277 304 (260–361) 19 (9–30) 16 (9–21) 0.9 (0.6-1.2) 888 174 (138–201) 16 (7–25) 12 (8–19) 0.7 (0.5-1.0)
Light to moderate 756 323 (276–369) 20 (9–30) 18 (10–26) 1.0 (0.8-1.2) 760 175 (145–204) 20 (7–25) 17 (9–23) 0.9 (0.7-1.1)
Heavy 122 312 (279–360) 19 (4–30) 16 (9–22) 0.9 (0.8-1.2) 379 181 (154–209) 20 (7–25) 17 (9–23) 0.9 (0.7-1.1)
  1. Grip strength in men *=1158 participants; grip strength in women †=1997 participants. Imputed values were used for grip strength (n = 138 for men and n = 415 for women), balance (n = 54 for men and n = 135 for women), chair stands (n = 32 for men and n = 71 for women) and walking speed (n = 37 for men and n = 99 for women). Numbers of missing values were 9 for chronic diseases (3 among men and 6 among women), 227 for BMI (27 among men and 200 among women), 33 for smoking (7 among men and 26 among women) and 30 for alcohol consumption (9 among men and 21 among women).