Table 2.
Patient reported outcome preoperatively and 1 year postoperatively in the different BMI categories. Values are mean (SD) CI
| Normal weight (N) | Overweight (O) | Obese I (I) | Obese II + III (II+) | p-value N vs O | p-value N vs I | p-value N vs II+ | p-value O vs I | p-value O vs II+ | p-value I vs II+ | |
|---|---|---|---|---|---|---|---|---|---|---|
| Preoperatively | ||||||||||
| KOOS | ||||||||||
| pain | 43 (15) 42–45 | 41 (15) 40–41 | 39 (15) 38–40 | 37 (15) 35–38 | 0.002 | < 0.001 | < 0.001 | 0.004 | < 0.001 | 0.009 |
| symptom | 50 (19) 48–51 | 48 (18) 47–49 | 47 (17) 46–49 | 45 (17) 43–47 | 0.04 | 0.006 | < 0.001 | 0.3 | 0.004 | 0.04 |
| ADL | 49 (16) 48–50 | 47 (15) 47–48 | 44 (15) 43–45 | 42 (16) 40–44 | 0.01 | < 0.001 | < 0.001 | < 0.001 | < 0.001 | 0.08 |
| sport/rec | 14 (15) 13–16 | 13 (14) 12–14 | 11 (14) 10–11 | 9 (14) 7–11 | 0.03 | < 0.001 | < 0.001 | < 0.001 | < 0.001 | 0.1 |
| QoL | 25 (14) 24–26 | 24 (14) 24–25 | 23 (14) 22–24 | 21 (13) 19–22 | 0.3 | 0.003 | < 0.001 | 0.008 | < 0.001 | 0.02 |
| EQ–VAS | 72 (21) 70–74 | 71 (21) 70–72 | 67 (21) 65–68 | 64 (22) 61–66 | 0.4 | < 0.001 | < 0.001 | < 0.001 | < 0.001 | 0.05 |
| Postoperatively | ||||||||||
| KOOS | ||||||||||
| pain | 80 (19) 79–82 | 80 (19) 79–81 | 78 (19) 77–79 | 78 (19) 77–79 | 0.4 | 0.02 | 0.02 | 0.06 | 0.07 | 0.6 |
| symptom | 77 (17) 76–78 | 76 (17) 75–77 | 75 (17) 74–76 | 75 (17) 74–76 | 0.3 | < 0.001 | 0.1 | 0.06 | 0.4 | 0.8 |
| ADL | 81(18) 79–82 | 79 (19) 78–80 | 76 (19) 75–77 | 74 (20) 72–76 | 0.5 | < 0.001 | < 0.001 | < 0.001 | < 0.001 | 0.1 |
| sport/rec | 40 (27) 38–42 | 39 (27) 38–40 | 34 (27) 32–36 | 32 (28) 32–35 | 0.3 | < 0.001 | < 0.001 | < 0.001 | < 0.001 | 0.2 |
| QoL | 66 (23) 64–68 | 65 (24) 64–66 | 62 (24) 60–63 | 61 (25) 60–63 | 0.4 | < 0.001 | 0.008 | 0.002 | 0.02 | 0.8 |
| EQ–VAS | 78 (19) 77–80 | 77 (19) 76–78 | 74 (20) 73–75 | 72 (20) 69–75 | 0.3 | < 0.001 | < 0.001 | < 0.001 | < 0.001 | 0.2 |
| Change | ||||||||||
| KOOS | ||||||||||
| pain | 32 (21) 30–34 | 34 (21) 33–35 | 35 (22) 33–36 | 36 (23) 34–39 | 0.08 | 0.02 | 0.006 | 0.3 | 0.07 | 0.2 |
| symptom | 27 (22) 25–29 | 28 (22) 27–29 | 27 (22) 26–29 | 28 (22) 27–29 | 0.3 | 0.7 | 0.05 | 0.5 | 0.1 | 0.5 |
| ADL | 31 (19) 30–33 | 32 (20) 31–33 | 32 (20) 31–34 | 32 (20) 31–33 | 0.8 | 0.3 | 0.6 | 0.4 | 0.6 | 0.9 |
| sport/rec | 26 (27) 24–28 | 26 (27) 25–28 | 23 (27) 21–25 | 23 (29) 19–26 | 0.8 | 0.05 | 0.09 | 0.006 | 0.04 | 0.7 |
| QoL | 41 (23) 39–43 | 41 (25) 40–42 | 39 (26) 38–41 | 41 (25) 38–44 | 0.8 | 0.1 | 0.8 | 0.1 | 1.0 | 0.3 |
| EQ–VAS | 5 (25) 3–7 | 5 (26) 4-–7 | 8 (26) 5–11 | 8 (25) 5–11 | 0.09 | 0.2 | 0.5 | 0.1 | 0.1 | 0.5 |
For abbreviations, see Table 1