Table 2.
Comparison of baseline characteristics between high-noise and low-noise groups [cases (%), (x ± s)]
| General data | High-noise group (n = 30) | Low-noise group (n = 28) | Fisher’s exact test/t | P |
|---|---|---|---|---|
| Age (years) | 51.83 ± 5.02 | 52.37 ± 4.30 | t = 0.439 | 0.663 |
| Gender | 0.936* | |||
| Male | 27 (90.00) | 26 (92.86) | ||
| Female | 3 (10.00) | 2 (7.14) | ||
| BMI (kg/m2) | 22.19 ± 1.65 | 22.38 ± 1.17 | t = 0.503 | 0.617 |
| Smoking history, n (%) | 11 (36.66) | 9 (32.14) | 0.131 | 0.717 |
| Educational level | ||||
| High school or technical secondary school and below | 21 (70.00) | 18 (64.29) | 0.215 | 0.643 |
| College and above | 9 (30.00) | 10 (35.71) | ||
| Type of surgery | 0.003 | 0.956 | ||
| Hip replacement | 12 (40.00) | 11 (39.29) | ||
| Knee replacement | 18 (60.00) | 17 (60.71) | ||
| Operation time (min) | 114.35 ± 27.86 | 120.04 ± 33.21 | t = 0.709 | 0.482 |
| Intraoperative blood loss (mL) | 558.74 ± 41.56 | 560.47 ± 48.52 | t = 0.146 | 0.884 |
| Underlying disease | ||||
| Coronary heart disease | 1 (3.33) | 1 (3.57) | 0.503 | |
| Hypertension | 8 (26.67) | 4 (14.29) | 0.402 | |
| Diabetes | 3 (10.00) | 4 (14.29) | 0.922 | |
| Length of stay (d) | 23.47 ± 4.69 | 24.72 ± 5.18 | t = 0.965 | 0.339 |
*Using Fisher’s exact test.