Table 2.
Sleep outcome descriptive statistics at one- and six-months, overall and by infant race/ethnicity.
| Duration | Overall (N = 394) | NH White (N = 158) | Hispanic (N = 131) | Black (N = 44) | Asian (N = 60) | |
|---|---|---|---|---|---|---|
| 1-month |
Total Duration’ | 15.2 (2.7) | 15.3 (2.3) | 14.9 (2.9) | 15.4 (3.1) | 15.4 (2.7) |
| Night Duration | 8.9 (1.5) | 9.0 (1.4) | 8.6 (1.6) | 8.8 (1.8) | 9.2 (1.4) | |
| Day Duration’ | 6.3 (2.0) | 6.3 (1.7) | 6.2 (2.2) | 6.4 (2.4) | 6.3 (1.8) | |
| Continuity | ||||||
| Number of Night Wakings | 2.6 (1.1) | 2.5 (1.0) | 2.5 (1.2) | 2.5 (0.9) | 2.9 (1.3) | |
| Longest Stretch of Sleep |
3.8 (1.2) |
3.9 (1.2) |
3.9 (1.2) |
3.4 (1.1) |
3.6 (1.2) |
|
|
Duration |
Overall (N = 309) |
NH White (N = 128) |
Hispanic (N = 100) |
Black (N = 33) |
Asian (N = 47) |
|
| 6-months | Total Duration | 13.0 (1.9) | 13.3 (1.6) | 12.6 (2.1) | 13.0 (2.5) | 12.7 (1.6) |
| Night Duration | 9.9 (1.3) | 10.4 (1.1) | 9.4 (1.3) | 9.7 (1.3) | 10.1 (1.2) | |
| Day Duration | 3.0 (1.4) | 3.0 (1.1) | 3.2 (1.6) | 3.2 (2.0) | 2.6 (1.2) | |
| Continuity | ||||||
| Number of Night Wakings | 1.8 (1.0) | 2.0 (1.0) | 1.7 (0.9) | 1.8 (1.0) | 1.8 (0.8) | |
| Longest Stretch of Sleep | 6.8 (2.5) | 7.0 (2.7) | 6.8 (2.2) | 7.0 (2.8) | 6.0 (2.3) | |
Mean (SD); one mother refused/didn't know her infant's race/ethnicity; ‘: two mothers (<1%) had missing day sleep duration and therefore total duration at one-month.