TABLE 2.
Sleep characteristics at 1 mo of age by RWG and OW status
| Sleep variable | Overall |
RWG |
OW |
||||||
|---|---|---|---|---|---|---|---|---|---|
| M (SD) or n(%) |
RWG (n = 45) | No RWG (n = 81) |
X2/t | P | OW (n = 41) |
No OW (n = 55) |
X2/t | P | |
| Bedtime (hh:mm) | 9:52 (0:57) | 9:55 (0:56) | 9:55 (0:57) | −0.48 | .63 | 9:44 (1:02) | 9:51 (0:51) | 0.55 | .59 |
| Nap frequency | 3.8 (1.3) | 3.6 (1.0) | 4.0 (1.4) | 1.96 | .05 | 4.1 (1.3) | 3.8 (1.1) | −1.18 | .24 |
| Nap frequency (top quartile: ≥5) | 23 (18.3) | 2 (4.4) | 21 (25.9) | 9.0 | .003 | 9 (22.0) | 9 (16.4) | 0.48 | .49 |
| Longest nocturnal sleep bout (h) | 4.6 (1.7) | 4.6 (1.5) | 4.5 (1.8) | −0.48 | .63 | 4.6 (1.6) | 4.5 (1.6) | −0.36 | .72 |
| Longest nocturnal sleep bout (top quartile: ≥5) | 47 (37.3) | 19 (42.2) | 28 (34.6) | 0.73 | .40 | 15 (36.6) | 20 (36.4) | 0.00 | .98 |
| Nocturnal TST (h) | 9.1 (1.4) | 9.2 ± 1.2 | 9.1 (1.4) | −0.13 | .90 | 9.6 (1.3) | 9.1 (1.3) | −2.11 | .037 |
| Diurnal TST (h) | 7.1 (1.7) | 7.1 (1.71) | 7.2 (1.8) | 0.33 | .74 | 7.2 (1.7) | 7.5 (1.5) | 1.01 | .32 |
| 24-h TST (h) | 16.3 (2.4) | 16.2 (2.3) | 16.3 (2.5) | 0.15 | .87 | 16.8 (2.5) | 16.5 (2.2) | −0.53 | .60 |
| 24-h TST categoriesa | 1.0 | .61 | 3.71 | .16 | |||||
| <14 | 21 (16.7) | 6 (13.3) | 15 (18.5) | 6 (14.6) | |||||
| 14-17 | 63 (50.0) | 25 (55.6) | 38 (46.9) | 15 (36.6) | |||||
| >17 | 42 (33.3) | 14 (31.1) | 28 (34.6) | 20 (48.8) | |||||
| Difference in Nocturnal and Diurnal TST (h) | 2.0 (1.9) | 2.1 (1.9) | 2.0 (2.0) | −0.38 | .70 | 2.5 (1.7) | 1.6 (1.8) | −2.52 | .013 |
Abbreviation: TST, total sleep time.
a
Based upon National Sleep Foundation recommendations.31