Table 2 Means, standard deviations and 95% confidence intervals of demographic, health, fear of re-injury, personal importance of exercise and time spent in physical activities at baseline and Year 1 to 3 follow-up
|  | Pre-ACL surgery baseline (n = 121) | Year 1 follow-up (n = 115) | Year 2 follow-up (n = 107) | Year 3 follow-up (n = 95) |
|---|---|---|---|---|
Mean (95% CI) | Mean (95% CI) | Mean (95% CI) | Mean (95% CI) | |
Age in years (SD) | 27.6 (6.2) | Â | Â | Â |
(range 18–40 yrs) | ||||
Causes of initial injury (n, %) | Â | Â | Â | Â |
 Soccer | 33 (27.3%) |  |  |  |
 Basketball | 17 (14.1%) |  |  |  |
 Skiing | 15 (12.4%) |  |  |  |
 Ultimate frisbee/racquet | 11 (9.1%) |  |  |  |
 Sports |  |  |  |  |
 Football/Rugby | 9 (7.4%) |  |  |  |
 Baseball/Softball | 8 (6.6%) |  |  |  |
 Volleyball | 6 (5.0%) |  |  |  |
 Hockey | 5 (4.1%) |  |  |  |
 Other | 17 (14.0%) |  |  |  |
Gender N (%) | Â | Â | Â | Â |
 Male | 77 (63.6) | 73 (63.5) | 67 (62.6) | 59 (62.1) |
 Female | 44 (36.4) | 42 (36.5) | 40 (37.4) | 36 (37.9) |
Body mass index (BMI) | 24.8 (24.2, 25.4) | 25.0 (24.3, 25.6) | 25.1 (24.4, 25.7) | 25.0 (24.2, 25.7) |
Pain | 66.9 (64.3, 69.6) | 87.5 (85.6, 89.5) | 91.8 (90.1, 93.5) | 91.9a (89.8, 94.1) |
Sports and recreation activity limitations | 10.8 (9.0, 12.5) | 61.2 (56.6, 65.7) | 74.3(70.0, 78.6) | 78.7a(74.5, 82.8) |
Fear of re-injury | 77.2(73.0, 81.4) | 49.0(43.0, 54.9) | 38.6(32.4, 44.7) | 32.6a(26.2, 39.1) |
Personal importance of exercise | 38.2(37.1, 39.3) | 36.0(34.7, 37.4) | 36.4(35.0, 37.8) | 36.2(34.9, 37.6) |
Physical activity | Â | Â | Â | Â |
 Walking | 482.6(418.8, 546.5) | 436.0(358.5, 513.4) | 418.1(365.8, 470.4) | 452.6(378.7, 526.5) |
 Household activities | 281.2(235.0, 327.4) | 285.5(239.4, 331.6) | 293.2(256.0, 330.4) | 320.6(273.8, 367.5) |
 Lower risk for knee injury | 311.5(265.0, 358.1) | 201.6(165.8, 237.5) | 246.4(205.6, 287.1) | 214.3b(182.8, 245.8) |
 Higher risk for knee injury | 192.6(156.2, 229.0) | 38.5(24.4, 52.7) | 110.3(69.5, 151.2) | 91.8a(58.1, 125.4) |
 Physical activities | ||||