Table 1.
Baseline characteristics of US female participants in NHANES from 2007–2018, weighted.
| Characteristic | Nonstone formers N = 12,197 | Stone formers N = 1,065 | P-value |
|---|---|---|---|
| Age(years) | 47.69 ± 17.10 | 51.61 ± 15.81 | <0.0001 |
| Total calcium(mg/dl) | 9.37 ± 0.37 | 9.38 ± 0.45 | 0.214 |
| Serum creatinine(mg/dl) | 0.77 ± 0.27 | 0.84 ± 0.66 | <0.0001 |
| BMI(kg/m2) | 28.99 ± 7.48 | 31.00 ± 7.85 | <0.0001 |
| Race(%) | <0.0001 | ||
| Mexican American | 7.97 | 6.82 | |
| Other hispanic | 6.03 | 4.5 | |
| Non-hispanic white | 66.38 | 75.87 | |
| Non-hispanic black | 11.78 | 6.96 | |
| Other race | 7.85 | 5.84 | |
| Infection status(%) | <0.0001 | ||
| No | 98.81 | 97.1 | |
| Yes | 1.19 | 2.9 | |
| Blood pressure(%) | <0.0001 | ||
| Yes | 69.53 | 52.13 | |
| No | 30.38 | 47.74 | |
| Unclear | 0.09 | 0.14 | |
| Education level(%) | 0.4675 | ||
| Less than high school | 15.56 | 16.85 | |
| High school | 22.06 | 23.05 | |
| More than high school | 62.3 | 59.99 | |
| Unclear | 0.08 | 0.11 | |
| Marital status(%) | 0.6637 | ||
| Cohabitation | 60.16 | 61.51 | |
| Solitude | 39.8 | 38.46 | |
| Unclear | 0.04 | 0.03 | |
| PIR(%) | 0.0717 | ||
| <1.39 | 31 | 34.27 | |
| 1.39–3.49 | 23.54 | 23.23 | |
| ≥3.49 | 38.03 | 34.63 | |
| Unclear | 7.43 | 7.87 | |
| Ever receive blood transfusion(%) | <0.0001 | ||
| Yes | 12.1 | 21.53 | |
| No | 86.95 | 77.55 | |
| Other | 0.95 | 0.92 | |
| Total water(%) | 0.0562 | ||
| <2000 ml | 51.47 | 52.22 | |
| 2000–2500 ml | 7.82 | 9.81 | |
| More than 2500 ml | 26.3 | 25.12 | |
| Unclear | 14.41 | 12.86 | |
| Physical activity(%) | 0.001 | ||
| Never | 32.89 | 37.69 | |
| Moderate | 36.74 | 37.04 | |
| Vigorous | 30.35 | 25.24 | |
| Unclear | 0.02 | 0.03 | |
| Alcohol (%) | 0.0854 | ||
| Yes | 22.72 | 25.07 | |
| No | 50.2 | 46.6 | |
| Unclear | 27.08 | 28.33 | |
| Diabetes (%) | <0.0001 | ||
| No | 89.69 | 79.54 | |
| Yes | 8.37 | 16.67 | |
| Borderline | 1.87 | 3.43 | |
| Unclear | 0.07 | 0.36 |
Statistically significant, p < 0.05; Mean+SD for continuous variables. P-value was calculated by weighted linear regression model.
% for categorical variables, P-value was calculated by weighted chi-square test.
HCV, Hepatitis C virus; BMI, Body mass index (kg/m2); PIR, Ratio of family income to poverty.