Table 4.
Descriptive data for sleep context variables from 1 to 12 months of age
| na | 1 month | 3 months | 6 months | 9 months | 12 months | |
|---|---|---|---|---|---|---|
| State at crib entry | ||||||
| Awake | 76 | 6 (8) | 15 (20) | 24 (32) | 19 (25) | 24 (32) |
| Asleep | 76 | 46 (61) | 36 (47) | 34 (45) | 38 (50) | 36 (47) |
| Mixed | 76 | 24 (32) | 25 (33) | 18 (24) | 19 (25) | 16 (21) |
| Crib location | ||||||
| Own room | 78 | 17 (22) | 34 (44) | 53 (68) | 58 (74) | 59 (76) |
| Parents’ room | 78 | 61 (78) | 44 (56) | 25 (32) | 20 (26) | 19 (24) |
| Sleep aid use | ||||||
| % awakenings | 57 | 29.1 (31.2) | 55.7 (37.0) | 60.4 (34.4) | 43.6 (33.8) | 54.8 (36.6) |
| Soft object | 76 | 0 (0) | 0 (0) | 1 (1) | 2 (3) | 4 (5) |
| Pacifier | 76 | 17 (22) | 7 (9) | 7 (9) | 11 (15) | 12 (16) |
| Thumb/fingers | 76 | 14 (18) | 18 (24) | 6 (8) | 3 (4) | 5 (7) |
| T-shirt (RSA/SC) | 76 | 3 (4) | 1 (1) | 2 (3) | 3 (4) | 1 (1) |
| Mixed w/o T-shirt | 76 | 8 (11) | 30 (39) | 24 (32) | 23 (30) | 21 (28) |
| Mixed w/T-shirt | 76 | 1 (1) | 6 (8) | 26 (34) | 14 (18) | 13 (17) |
| None | 76 | 33 (43) | 14 (18) | 10 (13) | 20 (26) | 20 (26) |
| Night interventions | ||||||
| # asleep | 74 | 1.4 (1.7) | 1.6 (1.8) | 1.6 (1.6) | 1.4 (1.2) | 1.2 (1.3) |
| Dur. to intv. (min) | 57 | 3.4 (2.5) | 3.3 (3.7) | 3.0 (3.0) | 2.8 (2.7) | 3.1 (4.3) |
Note. Results are reported as frequency or mean. Numbers in parentheses indicate percents or standard deviations.
a
Number of subjects (n) reflects subjects with complete data for the given variable. For ‘% awakenings where baby uses a sleep aid’ and ‘Duration to intervention,’ the number of subjects is reduced because some had no awakenings.