Table 1B.
Knee level Descriptive Statistics by CPEI quintiles.
| Characteristic | Q1 | Q2 | Q3 | Q4 | Q5 | p-value | |
|---|---|---|---|---|---|---|---|
| Number of Knees | 467 | 483 | 460 | 475 | 469 | -- | |
| Mean ± SD CPEI | 9.07 ± 3.12 | 14.92 ± 1.19 | 18.56 ± 0.95 | 22.17 ± 1.18 | 27.83 ± 3.03 | ||
| Min, P25, P50, P75, max CPEI | −7.7, 7.5, 9.7, 11.5, 12.7 | 12.8, 13.9, 15, 16, 16.8 | 16.9, 17.8, 18.6, 19.3, 20.2 | 20.3, 21.2, 22.1, 23.2, 24.3 | 24.4, 25.3, 27, 29.4, 40.2 | ||
| Mean ± SD Number of children (self-reported at 30m) | 2.61 ± 1.65 | 2.51 ± 1.71 | 2.44 ± 1.71 | 2.34 ± 1.48 | 2.27 ± 1.55 | .0131 | |
| Min, P25, P50, P75, max Number of children | 0, 2, 2, 3, 12 | 0, 2, 2, 3, 12 | 0, 2, 2, 3, 12 | 0, 1, 2, 3, 8 | 0, 1, 2, 3, 9 | ||
| N (%) Parity | 0 | 50 (10.7%) | 64 (13.3%) | 64 (13.9%) | 61 (12.8%) | 69 (14.7%) | 0.1526 |
| 1 child | 50 (10.7%) | 46 (9.5%) | 47 (10.2%) | 64 (13.5%) | 57 (12.2%) | ||
| 2 children | 137 (29.3%) | 152 (31.5%) | 153 (33.3%) | 149 (31.4%) | 167 (35.6%) | ||
| 3–4 children | 180 (38.5%) | 174 (36.0%) | 152 (33.0%) | 168 (35.4%) | 140 (29.9%) | ||
| 5–12 children | 50 (10.7%) | 47 (9.7%) | 44 (9.6%) | 33 (6.9%) | 36 (7.7%) | ||
| N (%) Clinic site | UAB | 184 (39.4%) | 219 (45.3%) | 196 (42.6%) | 217 (45.7%) | 236 (50.3%) | 0.0147 |
| UIowa | 283 (60.6%) | 264 (54.7%) | 264 (57.4%) | 258 (54.3%) | 233 (49.7%) | ||
| N (%) Race | White or Caucasian | 428 (91.6%) | 423 (87.6%) | 405 (88.0%) | 403 (84.8%) | 387 (82.5%) | 0.0026 |
| Black or African American | 37 (7.9%) | 54 (11.2%) | 47 (10.2%) | 67 (14.1%) | 77 (16.4%) | ||
| Other | 2 (0.4%) | 6 (1.2%) | 8 (1.7%) | 5 (1.1%) | 5 (1.1%) | ||
| N (%) Type of work – Most adult life | Sales, Office Work | 236 (50.5%) | 244 (50.5%) | 254 (55.2%) | 260 (54.7%) | 262 (55.9%) | 0.5006 |
| Skilled, Unskilled, Farming, Technician, Housework | 122 (26.1%) | 129 (26.7%) | 102 (22.2%) | 104 (21.9%) | 103 (22.0%) | ||
| Other | 109 (23.3%) | 110 (22.8%) | 104 (22.6%) | 111 (23.4%) | 104 (22.2%) | ||
| Mean ± SD Age at 60m | 68.9 ± 7.4 | 68.3 ± 7.7 | 67.3 ± 7.4 | 67.3 ± 7.5 | 66.6 ± 7.4 | <.0001 | |
| Mean ± SD BMI at 60m | 29.9 ± 5.4 | 29.6 ± 5.7 | 30.7 ± 6.5 | 31.4 ± 6.5 | 31.1 ± 6.2 | <.0001 | |
| Mean ± SD BMI at BL (enrollment visit) | 29.4 ± 5.2 | 29.3 ± 5.3 | 30.4 ± 6.4 | 31.0 ± 6.4 | 30.5 ± 5.9 | <.0001 | |
| Mean ± SD BMI at 25 yo (self-reported weight and height) | 21.9 ± 3.3 | 21.9 ± 3.3 | 22.4 ± 4.0 | 22.4 ± 3.4 | 22.7 ± 3.4 | .0020 | |
| Mean ± SD PASE at BL (enrollment visit) | 159.6 ± 77.1 | 161.8 ± 76.9 | 162.4 ± 72.3 | 161.9 ± 76.0 | 168.4 ± 80.0 | 0.4761 | |
| ROA status at baseline | No | 248 (53.1%) | 276 (57.1%) | 273 (59.3%) | 276 (58.1%) | 275 (58.6%) | .9627 |
| Yes | 209 (44.8%) | 199 (41.2%) | 179 (38.9%) | 190 (40.0%) | 185 (39.4%) | ||
| KR or exclusion | 9 (1.9%) | 7 (1.4%) | 7 (1.5%) | 8 (1.7%) | 8 (1.7%) | ||
| no TF/PF unknown | 1 (0.2%) | 1 (0.2%) | 1 (0.2%) | 1 (0.2%) | 1 (0.2%) | ||
| ROA status at 60m | No | 185 (39.6%) | 224 (46.4%) | 208 (45.2%) | 203 (42.7%) | 207 (44.1%) | .5108 |
| Yes | 224 (48.0%) | 208 (43.1%) | 197 (42.8%) | 217 (45.7%) | 216 (46.1%) | ||
| KR or exclusion | 53 (11.3%) | 50 (10.4%) | 53 (11.5%) | 52 (10.9%) | 41 (8.7%) | ||
| no TF/PF unknown | 5 (1.1%) | 1 (0.2%) | 2 (0.4%) | 3 (0.6%) | 5 (1.1%) | ||
Abbreviations: BMI, body mass index; CPEI, center of pressure excursion index; KR, Knee replacement; PASE, physical activity scale for the elderly; ROA, radiographic osteoarthritis; TF/PF, Tibiofemoral/Patellofemoral