Table 2:
The Relationship of Risk Factors to the Classification of and Relationship to Follow-up in the Study Cohort
| Risk Factors | Study Cohort | |||
|---|---|---|---|---|
| N = 3,202 | Completed Follow-up |
Lost to Follow-up | p-value | |
| 2,821 (88%) | 381 (12%) | |||
| Consortium Site | 0.0029 | |||
| #1 | 684 (21%) | 610 (22%) | 74 (19%) | |
| #2 | 185 (6%) | 165 (6%) | 20 (5%) | |
| #3 | 869 (27%) | 737 (26%) | 132 (35%) | |
| #4 | 130 (4%) | 124 (4%) | 6 (2%) | |
| #5 | 139 (4%) | 122 (4%) | 17 (4%) | |
| #6 | 757 (24%) | 682 (24%) | 75 (20%) | |
| #7 | 438 (14%) | 381 (14%) | 57 (15%) | |
| Sex | ||||
| Male | 1,791 (56%) | 1,539 (55%) | 252 (66%) | <0.0001 |
| Female | 1,411 (44%) | 1,282 (45%) | 129 (34%) | |
| Race | ||||
| White | 2,645 (83%) | 2,394 (85%) | 251 (66%) | <0.0001 |
| Black | 278 (9%) | 194 (7%) | 84 (22%) | |
| Other | 279 (9%) | 233 (8%) | 46 (12%) | |
| Marital Status | ||||
| Married | 882 (29%) | 803 (30%) | 79 (22%) | 0.0041 |
| Single | 2,090 (68%) | 1,827 (67%) | 263 (73%) | |
| Separated | 112 (4%) | 93 (3%) | 19 (5%) | |
| Missing | 118 (4%) | |||
| Smoking Status | ||||
| Current | 292 (9%) | 236 (9%) | 56 (15%) | 0.0002 |
| Never | 2,548 (80%) | 2,264 (81%) | 284 (76%) | |
| Quit | 325 (10%) | 292 (10%) | 33 (9%) | |
| Missing | 37 (1%) | |||
| Home Phone Number Provided | ||||
| Yes | 2,984 (93%) | 2,635 (93%) | 349 (92%) | 0.1891 |
| No | 218 (7%) | 186 (7%) | 32 (8%) | |
| Cell Phone Number Provided | ||||
| Yes | 1,136 (36%) | 998 (81%) | 138 (78%) | 0.257 |
| No | 265 (8%) | 226 (19%) | 39 (22%) | |
| Missing | 1,801 (56%) | |||
| Primary Email Provided | ||||
| Yes | 2,070 (65%) | 1,859 (66%) | 211 (55%) | 0.0001 |
| No | 1,132 (35%) | 962 (34%) | 170 (45%) | |
| Secondary Email Provided | ||||
| Yes | 273 (9%) | 251 (9%) | 22 (6%) | 0.0405 |
| No | 2,929 (91%) | 2,570 (91%) | 359 (94%) | |
| Years of School Completed | 14 (11, 16) | 14 (11, 16) | 13 (11, 16) | 0.0013 |
| Missing | 17 (1%) | |||
| Average Hours Worked per Week | 25 (0, 44) | 25 (0, 45) | 30 (0, 40) | 0.9272 |
| Missing | 564 (18%) | |||
| Works Full Time | ||||
| Yes | 1,181 (37%) | 1,050 (37%) | 131 (34%) | 0.2812 |
| No | 2,021 (63%) | 1,771 (63%) | 250 (66%) | |
| Works Part Time | ||||
| Yes | 314 (10%) | 278 (10%) | 36 (9%) | 0.8026 |
| No | 2,888 (90%) | 2,543 (90%) | 345 (91%) | |
| Works as Homemaker | ||||
| Yes | 99 (3%) | 88 (3%) | 11 (3%) | 0.8058 |
| No | 3,103 (97%) | 2,733 (97%) | 370 (97%) | |
| Retired | ||||
| Yes | 24 (1%) | 23 (1%) | 1 (0%) | 0.3499 |
| No | 3,178 (99%) | 2,798 (99%) | 380 (100%) | |
| Student | ||||
| Yes | 1,504 (47%) | 1,335 (47%) | 169 (44%) | 0.2761 |
| No | 1,698 (53%) | 1,486 (53%) | 212 (56%) | |
| Disabled | ||||
| Yes | 100 (3%) | 79 (3%) | 21 (5%) | 0.0043 |
| No | 3,102 (97%) | 2,742 (97%) | 360 (95%) | |
| Working Other | ||||
| Yes | 131 (4%) | 102 (4%) | 29 (8%) | 0.0002 |
| No | 3,071 (96%) | 2,719 (96%) | 352 (92%) | |
| How many people live at home with patients | 2 (1, 3) | 2 (1, 3) | 2 (1, 3) | 0.4558 |
| Missing | 330 (10%) | |||
| Lives Alone | ||||
| Yes | 292 (9%) | 259 (9%) | 33 (9%) | 0.7408 |
| No | 2,910 (91%) | 2,562 (91%) | 348 (91%) | |
| Lives with Parents | ||||
| Yes | 1,301 (41%) | 1,153 (41%) | 148 (39%) | 0.4496 |
| No | 1,901 (59%) | 1,668 (59%) | 233 (61%) | |
| Lives with Partner | ||||
| Yes | 1,012 (32%) | 909 (32%) | 103 (27%) | 0.0409 |
| No | 2,190 (68%) | 1,912 (68%) | 278 (73%) | |
| Lives with Children | ||||
| Yes | 717 (22%) | 635 (23%) | 82 (22%) | 0.6643 |
| No | 2,485 (78%) | 2,186 (77%) | 299 (78%) | |
| Lives with Other | ||||
| Yes | 930 (29%) | 818 (29%) | 112 (29%) | 0.8719 |
| No | 2,272 (71%) | 2,003 (71%) | 269 (71%) | |
| Lives with Siblings | ||||
| Yes | 332 (24%) | 297 (24%) | 35 (20%) | 0.1891 |
| No | 1,069 (76%) | 927 (76%) | 142 (80%) | |
| Not Applicable | 1801 | 1597 | 204 | |
| Pre-OP KOOS Symptom Score | 68 (54, 82) | 68 (54, 82) | 64 (50, 79) | 0.0004 |
| Missing | 5 (0%) | |||
| Pre-OP KOOS Pain Score | 75 (61, 86) | 75 (61, 86) | 69 (53, 83) | <0.0001 |
| Missing | 7 (0%) | |||
| Pre-OP KOOS ADL Score | 87 (71, 96) | 87 (71, 96) | 82 (63, 93) | <0.0001 |
| Missing | 3 (0%) | |||
| Pre-OP KOOS Sports and Rec Score | 50 (25, 75) | 50 (25, 75) | 45 (20, 70) | 0.0234 |
| Missing | 63 (2%) | |||
| Pre-OP KOOS QOL Score | 38 (19, 50) | 38 (19, 50) | 31 (19, 44) | 0.0006 |
| Missing | 8 (0%) | |||
| Pre-OP MARX Score | 12 (8, 16) | 12 (8, 16) | 12 (6, 16) | 0.3665 |
| Missing | 26 (1%) | |||
| Pre-OP IKDC Score | 51 (39, 62) | 51 (39, 63) | 46 (33, 59) | <0.0001 |
| Missing | 47 (1%) | |||