TABLE 1.
Demographic Characteristics of Children Included in Final Sleep Comparison Analyses
| Demographic Variables |
Habitual Bed Sharers (n=80) | Solitary Sleepers (n=257) |
Total Sample (n=337) |
|---|---|---|---|
|
| |||
| Child Age, | |||
| Months | |||
| M(SD) | 53.00 (9.95) | 50.88 (9.34) | 51.38 (9.52) |
| Child Sex | |||
| (% Female) | 45.0% | 42.8% | 43.3% |
| Socio-Economic Status | |||
| Composite Score | |||
| M (SD) | 3.96 (1.89) | 4.92 (1.96) | 4.69 (1.98) |
| % Low SES (score 0–2) | 28.6% | 15.6% | 18.7% |
| % Middle SES (score 3–4) | 33.8% | 23.6% | 26.0% |
| % High SES (score 5–7) | 37.7% | 60.8% | 55.4% |
| Child Ethnicity | |||
| % Non-Hispanic | 61.3% | 76.3% | 72.7% |
| % Hispanic, Latinx, or Spanish origin | 36.3% | 20.6% | 24.3% |
| % Refused to answer | 2.5% | 3.1% | 3.0% |
| Child Race | |||
| % White | 48.8% | 70.4% | 65.3% |
| % Black, African-American | 10.0% | 7.4% | 8.0% |
| % Asian (East/Southeast and Asian Indian) | 3.8% | 3.2% | 3.3% |
| % Pacific Islander | 0.0% | 0.0% | 0.0% |
| % Other race not listed | 16.3% | 5.4% | 8.0% |
| % Biracial/Multiracial | 15.0% | 8.2% | 9.8% |
| % Refused to answer | 6.3% | 5.4% | 5.6% |
| Enrollment in Preschool | |||
| % Enrolled at least 1 day/wk | 96.3% | 96.9% | 96.7% |
| % Did not answer | 3.8% | 3.1% | 3.3% |
|
Actigraphy Variablesa M (SD) |
|||
| # of scorable actigraphy days | 9.71 (3.48) | 9.85 (3.47) | 9.82 (3.47) |
| Avg. Deviation in bedtime across days (min) | 41.04 (19.15) | 42.10 (20.51) | 41.85 (20.17) |
| Avg. Deviation in morning waketime across days (min) | 34.00 (14.12) | 35.65 (17.64) | 35.26 (16.86) |
| Avg. Deviation in overnight duration across days (min) | 46.18 (14.60) | 49.65 (23.40) | 48.82 (21.67) |
| Avg. Deviation in nap duration across days (min; n=281) | 23.01 (12.32) | 22.75 (12.22) | 22.81 (12.22) |
| Average bedtime (hr:min)b | 21:55 (±57min) | 21:10 (±49min) | 21:21 (±55min) |
| Average waketime (hr:min)b | 07:21 (±50min) | 06:52 (±39min) | 06:59 (±44min) |
a
For the number of actigraphy days and sleep regularity variables (average deviations across days), exploratory t-tests were conducted to determine whether bedsharing groups differed on these parameters. No comparisons reached significance (all ps>.11), suggesting that habitual bedsharers and solitary sleepers showed similar levels of day-to-day consistency in their sleep patterns.
b
Exploratory t-tests showed that average bedtimes and waketimes significantly differed between habitual bedsharers and solitary sleepers (see pp. 21–22 in the main text for more information).
M=Mean; SD= Standard Deviation; SES= socioeconomic status; wk= week; hr= hours; min= minutes.