Table 3.
Descriptive characteristics for derivation and validation data.
| Total (N = 6,167) | Derivation (n = 2,035) | Validation (n = 4,132) | P* | |
|---|---|---|---|---|
| Age (y) | 63.12 (11.00) | 62.95 (11.05) | 63.21 (10.98) | .38 |
| Race/ethnicity, n (%) | .43 | |||
| White | 4,852 (78.7) | 1,599 (78.6) | 3,253 (78.7) | |
| Black | 486 (7.9) | 146 (7.2) | 340 (8.2) | |
| Asian/Pacific Islander | 88 (1.4) | 26 (1.3) | 62 (1.5) | |
| Native American | 464 (7.5) | 163 (8.0) | 310 (7.3) | |
| Hispanic/Mexican | 274 (4.4) | 100 (4.9) | 174 (4.2) | |
| Other | 3 (0.1) | 1 (0.0) | 2 (0.1) | |
| AHI (events/h) | 8.52 (11.93) | 8.46 (11.76) | 8.55 (12.01) | .76 |
| Neck circumference (cm) | 37.83 (4.09) | 37.73 (4.08) | 37.88 (4.10) | .18 |
| Waist circumference (cm) | 97.24 (13.44) | 97.65 (13.57) | 97.04 (13.37) | .11 |
| Height (cm) | 167.33 (9.58) | 167.36 (9.55) | 167.31 (9.60) | .87 |
| Weight (kg) | 79.22 (16.26) | 79.23 (15.90) | 79.21 (16.44) | .96 |
| BMI (kg/m2) | 28.19 (4.86) | 28.22 (4.89) | 28.17 (4.85) | .71 |
| Snoring, n (%) | .68 | |||
| No | 3,147 (87.2) | 1,041 (86.8) | 2,106 (87.3) | |
| Yes | 464 (12.8) | 158 (13.2) | 306 (12.7) | |
| Tired, n (%) | .53 | |||
| No | 516 (8.4) | 164 (8.1) | 352 (8.5) | |
| Yes | 5,643 (91.6) | 1,871 (91.9) | 3,772 (91.5) | |
| Breathing†, n (%) | .36 | |||
| No | 2,380 (76.3) | 781 (75.3) | 1,599 (76.8) | |
| Yes | 739 (23.7) | 256 (24.7) | 483 (23.2) | |
| BP medication, n (%) | .45 | |||
| No | 3,717 (60.5) | 1,239 (61.1) | 2,478 (60.1) | |
| Yes | 2,431 (39.5) | 788 (38.9) | 1,643 (39.9) | |
| BMI > 35 kg/m2, n (%) | .48 | |||
| No | 5,503 (90.8) | 1,809 (90.5) | 3,694 (91.0) | |
| Yes | 556 (9.2) | 191 (9.6) | 365 (9.0) | |
| Age > 50 y, n (%) | .67 | |||
| No | 832 (13.5) | 280 (13.8) | 552 (13.4) | |
| Yes | 5,334 (86.5) | 1,755 (86.2) | 3,579 (86.6) | |
| Large neck‡, n (%) | .55 | |||
| No | 5,264 (85.8) | 1,744 (86.2) | 3,520 (85.6) | |
| Yes | 872 (14.2) | 280 (13.8) | 592 (14.4) | |
| Sex, n (%) | .64 | |||
| Male | 2,911 (47.2) | 952 (46.8) | 1,959 (47.4) | |
| Female | 3,256 (52.8) | 1,083 (53.2) | 2,173 (52.6) | |
| dSBQ > 3, n (%) | .68 | |||
| No | 2,081 (33.7) | 694 (34.1) | 1,387 (33.6) | |
| Yes | 4,086 (66.3) | 1,341 (65.9) | 2,745 (66.4) | |
| NHR, n (%) | .12 | |||
| < mean | 3,125 (51.8) | 1,060 (53.3) | 2,065 (51.1) | |
| ≥ mean | 2,905 (48.2) | 930 (46.7) | 1,975 (48.9) | |
| WHR, n (%) | .54 | |||
| < mean | 3,077 (53.3) | 1,018 (53.9) | 2,059 (53.0) | |
| ≥ mean | 2,697 (46.7) | 871 (46.1) | 1,826 (47.0) |
Data are presented as mean (standard deviation) for continuous measures and n (%) for categorical measures. *P value for chi-square tests for categorical data and t tests for continuous data. †Observed stopped breathing. ‡Neck circumference ≥ 43 cm for men and ≥ 41 cm for women. AHI = apnea-hypopnea index, BMI = body mass index, BP = blood pressure, dSBQ = derived STOP-Bang Questionnaire, NHR = neck circumference/height ratio, WHR = waist circumference/height ratio.