Table 1 Baseline characteristics for the overall cohort and the matched cohort
From: Long-term risk of reoperation after modular hemiarthroplasty
Overall cohort | Matched cohort | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Bipolar | Unipolar | p | SMD | Missing (%) | Bipolar | Unipolar | p | SMD | Missing | ||
Number of patients | 16,216 | 22,186 | 12,280 | 12,280 | |||||||
Mean age (SD) | 83.81 (6.75) | 84.47 (6.81) | < 0.001 | 0.098 | 0.0 | 84.53 (6.80) | 83.95 (6.95) | < 0.001 | 0.085 | 0.0 | |
Mean BMI (SD) | 23.93 (4.36) | 23.68 (3.97) | 0.001 | 0.060 | 62.8 | 23.91 (4.37) | 23.64 (4.03) | 0.004 | 0.063 | 66.0 | |
Age group - years (%) | < 75 | 1473 ( 9.1) | 1770 ( 8.0) | < 0.001 | 0.096 | 0.0 | 929 ( 7.6) | 1109 ( 9.0) | < 0.001 | 0.062 | 0.0 |
> 85 | 6970 (43.0) | 10,579 (47.7) | 5731 (46.7) | 5453 (44.4) | |||||||
75–85 | 7773 (47.9) | 9837 (44.3) | 5620 (45.8) | 5718 (46.6) | |||||||
Sex (%) | Men | 4709 (29.0) | 6970 (31.4) | < 0.001 | 0.052 | 0.0 | 3497 (28.5) | 3627 (29.5) | 0.070 | 0.023 | 0.0 |
Women | 11,507 (71.0) | 15,216 (68.6) | 8783 (71.5) | 8653 (70.5) | |||||||
Year of surgery 2 (%) | 2005–2006 | 3537 (21.8) | 2383 (10.7) | < 0.001 | 0.584 | 0.0 | 2199 (17.9) | 2101 (17.1) | 0.514 | 0.023 | 0.0 |
2007–2008 | 4294 (26.5) | 2746 (12.4) | 2447 (19.9) | 2508 (20.4) | |||||||
2009–2010 | 3025 (18.7) | 4376 (19.7) | 2397 (19.5) | 2434 (19.8) | |||||||
2011–2012 | 2438 (15.0) | 4908 (22.1) | 2322 (18.9) | 2322 (18.9) | |||||||
2013–2015 | 2922 (18.0) | 7773 (35.0) | 2915 (23.7) | 2915 (23.7) | |||||||
Approach (%) | Posterior | 8715 (53.7) | 6494 (29.3) | < 0.001 | 0.513 | 0.0 | 5384 (43.8) | 5212 (42.4) | 0.028 | 0.028 | 0.0 |
Lateral | 7501 (46.3) | 15,692 (70.7) | 6896 (56.2) | 7068 (57.6) | |||||||
Hospital type (%) | University or regional | 4677 (28.8) | 6037 (27.2) | < 0.001 | 0.121 | 0.0 | 3908 (31.8) | 4183 (34.1) | < 0.001 | 0.066 | 0.0 |
County | 9393 (57.9) | 12,250 (55.2) | 6915 (56.3) | 6856 (55.8) | |||||||
Rural | 2146 (13.2) | 3899 (17.6) | 1457 (11.9) | 1241 (10.1) | |||||||
ASA class (%) | 1 | 301 ( 3.3) | 340 ( 1.9) | < 0.001 | 0.129 | 30.6 | 242 ( 3.0) | 186 ( 2.2) | < 0.001 | 0.101 | 33.4 |
2 | 3524 (38.3) | 6189 (35.5) | 3001 (37.6) | 3044 (36.3) | |||||||
3 | 4931 (53.6) | 9719 (55.7) | 4350 (54.6) | 4589 (54.7) | |||||||
4 | 451 ( 4.9) | 1205 ( 6.9) | 380 ( 4.8) | 571 ( 6.8) | |||||||