Table 2.
Study sample characteristics among CARDIA participants with sleep data and with baseline and follow-up coronary calcification measurements.
| Category | N | Sleep hours Mean(SD) | Baseline Calcification Prevalence %(N) | Five Year Calcification Incidence %(N) |
|---|---|---|---|---|
| All Subjects | 535 | 6.1(1.0) | 7.5(40) | 12.3(61) |
| Sex/Race | ||||
| White Male | 144 | 6.1(.88) | 11.8(17) | 20.5(26) |
| Black Male | 85 | 5.2(1.1) | 9.4(8) | 23.4(18) |
| White Female | 157 | 6.7(.84) | 5.1(8) | 4.7(7) |
| Black Female | 149 | 5.9(.92) | 4.7(7) | 7.0(10) |
| Age (years) | ||||
| <38 | 121 | 6.0(1.1) | 3.3(4) | 8.5(10) |
| 38–41 | 193 | 6.1(1.0) | 7.3(14) | 10.1(18) |
| 42+ | 219 | 6.0(1.0) | 9.6(21) | 16.7(33) |
| Smoking Status | ||||
| Never | 337 | 6.1(1.0) | 5.0(17) | 10.9(35) |
| Past | 93 | 6.3(.93) | 8.6(8) | 9.4(8) |
| Current | 105 | 5.8(1.2) | 14.3(5) | 20.0(18) |
| High Density Lipoprotein Tertile (mg/dl)* | ||||
| (14,43) | 177 | 5.8(1.0) | 10.2(18) | 25.2(40) |
| (43,56) | 179 | 6.1(1.0) | 7.3(13) | 7.2(12) |
| (57,114) | 173 | 6.3(1.0) | 4.6(8) | 5.5(9) |
| Low Density Lipoprotein Tertile (mg/dl)* | ||||
| (39,98) | 174 | 6.1(1.1) | 5.2(9) | 9.7(16) |
| (98,124) | 171 | 6.1(.96) | 5.3(9) | 7.4(12) |
| (125,209) | 175 | 6.1(1.0) | 11.4(20) | 18.7(29) |
| Systolic Blood Pressure Tertile (mmHg) | ||||
| (83,103) | 170 | 6.3(.94) | 4.1(7) | 6.7.(11) |
| (104,114) | 181 | 6.1(1.0) | 6.6(12) | 13.0(22) |
| (115,181) | 184 | 5.9(1.1) | 11.4(21) | 17.2(28) |
| Diagnosed Diabetes | ||||
| No | 508 | 6.1(1.0) | 7.5(38) | 12.1(57) |
| Yes | 23 | 6.0(1.1) | 4.3(1) | 13.6(3) |
| Framingham Ten-Year Risk% | ||||
| <=1% | 402 | 6.1(1.0) | 4.7(19) | 9.1(35) |
| 2–4% | 97 | 6.0(1.0) | 14.4(14) | 20.5(17) |
| >=5% | 36 | 6.0(.96) | 19.4(7) | 31.0(9) |
| Apnea Risk | ||||
| Low | 465 | 6.1(1.0) | 6.9(32) | 12.0(52) |
| High | 70 | 5.8(1.0) | 11.4(8) | 14.5(9) |