Table 1.
subject characteristics and intraoperative factors. Normal continuous variables are presented as mean (standard deviation). Non-normal continuous variables presented as median [inter-quartile range]. Categorical data are presented as n (%). ∗Absolute values of standardised difference below 0.28 represent satisfactory balance for that demographic. †P-values 0.05 represent no statistical difference between the groups in the associated factor.
|
Patient characteristics | |||
|---|---|---|---|
|
Total hip arthroplasty | |||
| Oral (n = 98) | Intravenous (n = 98) | Standardised difference∗ | |
| Baseline factors | |||
| Age (yr) | 65 [57, 70] | 65 [61, 70] | −0.155 |
| Female | 55 (56) | 42 (43) | 0.268 |
| Race | 0.210 | ||
| White | 92 (94) | 87 (89) | |
| Non-White | 6 (6) | 11 (11) | |
| Ethnicity | 0.254 | ||
| Non-Hispanic | 90 (91) | 92 (94) | |
| Hispanic | 8 (9) | 6 (6) | |
| ASA physical status | 0.222 | ||
| 1 | 3 (3) | 5 (5) | |
| 2 | 82 (84) | 86 (88) | |
| 3 | 13 (13) | 7 (7) | |
| BMI (kg m−2) | 28.7 (5.1) | 29.6 (4.3) | 0.196 |
| Perioperative factors | |||
| Oral | Intravenous | P-value† | |
| Surgical time (min) | 76 [65, 95] | 83 [69, 95] | 0.097 |
| Drain use | 1 (1) | 1 (1) | 1.000 |
| Total knee arthroplasty | |||
| Baseline factors | |||
| Oral (n = 93) | Intravenous (n = 98) | Standardised difference∗ | |
| Age (yr) | 66 [60, 71] | 66 [61, 71] | 0.015 |
| Female | 56 (60) | 56 (57) | 0.062 |
| Race | 0.228 | ||
| White | 75 (81) | 81 (83) | |
| Non-White | 18 (19) | 17 (17) | |
| Ethnicity | 0.024 | ||
| Non-Hispanic | 85 (91) | 89 (91) | |
| Hispanic | 8 (9) | 9 (9) | |
| ASA physical status | 0.136 | ||
| 1 | 3 (3) | 2 (2) | |
| 2 | 76 (82) | 84 (87) | |
| 3 | 14 (15) | 11 (11) | |
| BMI (kg m−2) | 29.4 [26.9, 33.0] | 30.8 [26.0, 34.3] | −0.075 |
| Perioperative factors | |||
| Oral | I.V. | P-value† | |
| Surgical time (min) | 95 [79, 116] | 91 [76, 105] | 0.161 |
| Tourniquet time (min) | 49 [39, 65] | 48 [37, 60] | 0.197 |
| Drain use | 11 (12) | 6 (6) | 0.180 |