Table 1 Baseline characteristics of the study population.
From: Association between relative fat mass and kidney stones in American adults
Characteristic | Relative fat mass (%) | P-value | |||
|---|---|---|---|---|---|
Q1 (N = 7428) | Q2 (N = 7428) | Q3 (N = 7428) | Q4 (N = 7428) | ||
Age(years) | 42.08 (41.52, 42.64) | 48.07 (47.46, 48.69) | 48.17 (47.58, 48.75) | 51.28 (50.74, 51.82) | < 0.0001 |
Gender (%) |  |  |  |  | < 0.0001 |
 Male | 96.36 (95.72, 96.92) | 72.72 (70.85, 74.52) | 18.99 (17.54, 20.52) | 0.05 (0.02, 0.12) |  |
 Female | 3.64 (3.08, 4.28) | 27.28 (25.48, 29.15) | 81.01 (79.48, 82.46) | 99.95 (99.88, 99.98) |  |
Race (%) |  |  |  |  | < 0.0001 |
 Mexican American | 7.24 (6.08, 8.60) | 9.37 (7.81, 11.20) | 7.75 (6.42, 9.32) | 10.73 (8.82, 12.99) |  |
 Other Hispanic | 5.57 (4.65, 6.66) | 5.94 (4.97, 7.07) | 5.97 (4.92, 7.23) | 6.34 (5.35, 7.49) |  |
 Non-Hispanic White | 65.53 (62.72, 68.24) | 69.42 (66.59, 72.11) | 68.37 (65.35, 71.24) | 63.10 (59.43, 66.62) |  |
 Non-Hispanic Black | 11.35 (10.03, 12.81) | 7.95 (6.84, 9.22) | 9.41 (8.12, 10.88) | 14.20 (12.22, 16.45) |  |
 Other Race | 10.31 (9.05, 11.72) | 7.33 (6.46, 8.30) | 8.50 (7.37, 9.79) | 5.64 (4.85, 6.53) |  |
Education level (%) |  |  |  |  | < 0.0001 |
 < High school | 14.89 (13.46, 16.43) | 15.24 (13.82, 16.79) | 13.89 (12.70, 15.18) | 18.87 (17.46, 20.37) |  |
 High school | 22.42 (20.53, 24.44) | 22.41 (20.91, 23.99) | 21.88 (20.54, 23.29) | 25.21 (23.93, 26.53) |  |
 > High school | 62.69 (60.05, 65.26) | 62.34 (59.97, 64.66) | 64.23 (62.09, 66.31) | 55.92 (54.12, 57.70) |  |
Marital status (%) |  |  |  |  | < 0.0001 |
 Never married | 26.73 (25.13, 28.41) | 16.66 (14.83, 18.66) | 14.66 (13.38, 16.03) | 14.03 (12.99, 15.13) |  |
 Married/Living with partner | 62.30 (60.45, 64.12) | 69.56 (67.63, 71.42) | 64.34 (62.64, 66.00) | 58.71 (57.03, 60.37) |  |
 Widowed/divorced/Separated | 10.97 (10.07, 11.93) | 13.79 (12.64, 15.02) | 21.00 (19.74, 22.33) | 27.27 (25.88, 28.69) |  |
PIR (%) |  |  |  |  | < 0.0001 |
 <1.3 | 22.25 (20.63, 23.95) | 18.86 (17.41, 20.41) | 20.96 (19.51, 22.50) | 28.67 (26.91, 30.51) |  |
 1.3–3.5 | 32.43 (30.53, 34.40) | 33.14 (31.47, 34.86) | 34.39 (32.83, 35.98) | 38.02 (36.47, 39.59) |  |
 ≥3.5 | 45.32 (42.78, 47.89) | 47.99 (45.76, 50.24) | 44.65 (42.42, 46.89) | 33.31 (31.16, 35.52) |  |
BMI (kg/m²) |  |  |  |  | < 0.0001 |
 <25 | 51.07 (49.32, 52.83) | 27.59 (25.81, 29.45) | 34.82 (33.34, 36.33) | 0.85 (0.65, 1.11) |  |
 25–30 | 45.21 (43.50, 46.94) | 26.74 (25.22, 28.33) | 39.74 (38.32, 41.17) | 18.98 (17.66, 20.37) |  |
 ≥30 | 3.72 (3.16, 4.37) | 45.66 (43.93, 47.40) | 25.44 (24.07, 26.86) | 80.17 (78.77, 81.50) |  |
Smoke at least 100 cigarettes per year (%) |  |  |  |  | < 0.0001 |
 Never | 51.73 (49.84, 53.62) | 51.33 (49.34, 53.31) | 59.72 (57.97, 61.44) | 60.82 (59.18, 62.44) |  |
 Now | 25.55 (23.84, 27.33) | 18.72 (17.51, 19.98) | 17.99 (16.63, 19.43) | 15.88 (14.87, 16.94) |  |
 Former | 22.72 (21.43, 24.06) | 29.95 (28.36, 31.60) | 22.30 (20.86, 23.80) | 23.30 (21.79, 24.88) |  |
At least 12 drinks per year(%) |  |  |  |  | < 0.0001 |
 No | 6.88 (6.07, 7.79) | 8.47 (7.45, 9.62) | 11.59 (10.55, 12.71) | 16.97 (15.59, 18.45) |  |
 Yes | 93.12 (92.21, 93.93) | 91.53 (90.38, 92.55) | 88.41 (87.29, 89.45) | 83.03 (81.55, 84.41) |  |
Hypertension (%) |  |  |  |  | < 0.0001 |
 No | 74.89 (73.50, 76.24) | 60.03 (58.23, 61.81) | 64.40 (62.97, 65.81) | 48.70 (47.21, 50.18) |  |
 Yes | 25.11 (23.76, 26.50) | 39.97 (38.19, 41.77) | 35.60 (34.19, 37.03) | 51.30 (49.82, 52.79) |  |
Diabetes (%) |  |  |  |  | < 0.0001 |
 No | 93.89 (93.05, 94.63) | 85.23 (84.05, 86.33) | 88.47 (87.50, 89.38) | 77.40 (76.26, 78.49) |  |
 Yes | 6.11 (5.37, 6.95) | 14.77 (13.67, 15.95) | 11.53 (10.62, 12.50) | 22.60 (21.51, 23.74) |  |
Kidney stones (%) |  |  |  |  | < 0.0001 |
 No | 92.49 (91.61, 93.29) | 88.12 (87.01, 89.14) | 90.87 (89.93, 91.72) | 88.82 (87.75, 89.81) |  |
 Yes | 7.51 (6.71, 8.39) | 11.88 (10.86, 12.99) | 9.13 (8.28, 10.07) | 11.18 (10.19, 12.25) |  |
HDL-C (mmol/L) | 1.35 (1.34, 1.36) | 1.32 (1.30, 1.34) | 1.49 (1.47, 1.51) | 1.36 (1.35, 1.37) | < 0.0001 |
RFM (%) | 24.78 (24.65, 24.91) | 32.14 (32.08, 32.20) | 39.11 (39.04, 39.18) | 46.98 (46.89, 47.08) | < 0.0001 |
Height (cm) | 176.11 (175.82, 176.39) | 172.10 (171.75, 172.44) | 164.54 (164.20, 164.89) | 160.60 (160.35, 160.86) | < 0.0001 |
Waist circumference (cm) | 89.68 (89.30, 90.06) | 100.23 (99.60, 100.86) | 97.28 (96.58, 97.97) | 111.83 (111.42, 112.25) | < 0.0001 |
