Table 1. Study cohort demographics.
| Characteristic | Any Hip or Knee Arthroplastya | Single Knee Arthroplastyb | Single Hip Arthroplastyb | Non-Arthritic Cohort | |||
|---|---|---|---|---|---|---|---|
| End Stage Arthritisc | 12+Months Postopd | End Stage Arthritisc | 12+Months Postopd | End Stage Arthritisc | 12+ Months Postopd | ||
| Overall, N | 514 | 2,992 | 149 | 566 | 177 | 843 | 68,389 |
| Sex, N (%) | |||||||
| Female | 301 (59) | 1,715 (57) | 79 (53) | 303 (54) | 103 (58) | 479 (57) | 38,168 (56) |
| Male | 213 (41) | 1,277 (43) | 70 (47) | 263 (46) | 74 (42) | 364 (43) | 30,221 (44) |
| Age, Median [IQR] | 67.9 [64.0 − 71.4] | 68.8 [64.9 − 72.1] | 68.3 [65.0 − 71.6] | 69.3 [65.8 − 72.3] | 67.7 [62.7 − 71.6] | 68.4 [64.2 − 71.7] | 62.6 [55.4 − 68.1] |
| Ethnicity, N (%) | |||||||
| White | 509 (99) | 2,949 (99) | 146 (98) | 554 (98) | 177 (100) | 834 (99) | 66,220 (97) |
| Non-white | 5 (1) | 43 (1) | 3 (2) | 12 (2) | 0 (0) | 9 (1) | 2,169 (3) |
| Body Mass Index, Median [IQR] | 28.2 [25.2 − 31.7] | 28.3 [25.5 − 31.7] | 28.4 [26.0 − 31.8] | 29.2 [26.4 − 32.9] | 26.8 [24.7 − 29.6] | 26.7 [24.3 − 29.8] | 25.6 [23.3 − 28.4] |
| CCI, Median [IQR] | 0 [0−0] | 0 [0−4] | 0 [0−4] | 0 [0−4] | 0 [0−0] | 0 [0−0] | 0 [0−0] |
| Wear Season, N (%) | |||||||
| Spring | 121 (24) | 653 (22) | 37 (25) | 113 (20) | 42 (24) | 175 (21) | 15,800 (23) |
| Summer | 153 (30) | 821 (27) | 40 (27) | 158 (28) | 54 (31) | 231 (27) | 18,071 (26) |
| Autumn | 136 (26) | 895 (30) | 39 (26) | 177 (31) | 48 (27) | 263 (31) | 20,181 (30) |
| Winter | 104 (20) | 623 (21) | 33 (22) | 118 (21) | 33 (19) | 174 (21) | 14,337 (21) |
| Education, N (%) | |||||||
| School Leaver | 152 (30) | 922 (31) | 39 (26) | 206 (36) | 57 (32) | 250 (30) | 14,812 (22) |
| Further Education | 171 (33) | 1,063 (36) | 58 (39) | 209 (37) | 40 (23) | 272 (32) | 22,277 (33) |
| Higher Education | 191 (37) | 1,007 (34) | 52 (35) | 151 (27) | 80 (45) | 321 (38) | 31,300 (46) |
| Smoking Status, N (%) | |||||||
| Never | 243 (47) | 1,495 (50) | 78 (52) | 267 (47) | 87 (49) | 454 (54) | 40,320 (59) |
| Former | 236 (46) | 1,330 (44) | 60 (40) | 270 (48) | 81 (46) | 336 (40) | 23,444 (34) |
| Current | 35 (7) | 167 (6) | 11 (7) | 29 (5) | 9 (5) | 53 (6) | 4,625 (7) |
| Alcohol Consumption, N (%) | |||||||
| Never | 29 (6) | 204 (7) | 8 (5) | 40 (7) | 9 (5) | 46 (5) | 3,745 (5) |
| < 3 Days Per Week | 233 (45) | 1,349 (45) | 69 (46) | 269 (48) | 74 (42) | 355 (42) | 30,777 (45) |
| 3+ Days Per Week | 251 (49) | 1,439 (48) | 72 (48) | 257 (45) | 94 (53) | 442 (52) | 33,867 (50) |
| Townsend Deprivation(34), N (%) | |||||||
| Least Deprived | 252 (49) | 1,549 (52) | 71 (48) | 280 (49) | 84 (47) | 457 (54) | 34,614 (51) |
| 2nd Quintile | 136 (26) | 671 (22) | 43 (29) | 125 (22) | 47 (27) | 181 (21) | 15,373 (22) |
| 3rd Quintile | 64 (12) | 400 (13) | 15 (10) | 89 (16) | 23 (13) | 110 (13) | 9,696 (14) |
| 4th Quintile | 46 (9) | 276 (9) | 14 (9) | 59 (10) | 15 (8) | 66 (8) | 6,484 (9) |
| Most Deprived | 16 (3) | 96 (3) | 6 (4) | 13 (2) | 8 (5) | 29 (3) | 2,222 (3) |
Percentages may not add up to 100% due to rounding
CCI: Charlson Comorbidity Index
a
Includes all participants with any combination of primary or revision knee or hip arthroplasties, excluding those who had their first arthroplasty less than 12 months before accelerometer wear (early recoverers), or more than 12 months after accelerometer wear (future first arthroplasty).
b
Single Hip and Single Knee Arthroplasty Cohorts are subsets of the Any Hip or Knee Arthroplasties Cohort as defined in Figure 1
c
End-stage arthritis is considered having their first arthroplasty within 12 months after accelerometer wear
d
Accelerometer wear more than 12 months after the participant's first primary knee or hip arthroplasty