Table 1.
Comparison of general information between the two groups [Mean ± SD, n (%)]
| Group | Observation group (n = 61) | Control group (n = 61) | χ2/t value | P value | |
|---|---|---|---|---|---|
| Gender | Male | 41 (67.21) | 38 (62.30) | 0.323 | 0.570 |
| Female | 20 (32.79) | 23 (37.70) | |||
| Age (years) | 52.67 ± 8.48 | 53.15 ± 8.63 | 0.310 | 0.757 | |
| BMI (kg/m2) | 23.15 ± 2.95 | 23.20 ± 2.77 | 0.097 | 0.923 | |
| ASA classification | I level | 23 (37.70) | 26 (42.62) | 0.307 | 0.580 |
| II level | 38 (62.30) | 35 (57.38) | |||
| RUSS scores | 4.02 ± 0.56 | 3.99 ± 0.67 | 0.268 | 0.789 | |
| CT values of stones (Hu) | 986.69 ± 136.07 | 992.74 ± 105.38 | 0.275 | 0.784 | |
| Maximum diameter of stones (cm) | 3.95 ± 0.40 | 3.97 ± 0.43 | 0.266 | 0.791 | |
| Number of stones | Single | 24 (39.34) | 25 (40.98) | 0.034 | 0.853 |
| Multiple | 37 (60.66) | 36 (59.02) | |||
| Location of stones | Upper and middle calices | 38 (62.30) | 40 (65.57) | 0.142 | 0.706 |
| Lower calices | 23 (37.70) | 21 (34.43) |
Note: BMI: body mass index; RUSS: Resurlu-Unsal Stone Score; ASA: American Standards Association; CT: computerized tomography.