Table 2 Frequencies of each sleep category at 6 and 12 months
6 months | 12 months | P value* | |||
|---|---|---|---|---|---|
Cut-offs 10th, 10-90th, 90th | N (%) | Cut-offs 10th, 10-90th, 90th | N (%) | ||
Nighttime sleep duration | Short (≤8.50 h) | 39 (12.4) | Short (< 9 h) | 42 (14.9) | < 0.001 |
Intermediate (8.51-11 h) | 196 (62.2) | Medium (9.01–11) | 142 (50.5) | 0.098 | |
Long (> 11 h) | 80 (25.4) | Long (> 11) | 97 (34.5) | < 0.001 | |
Daytime sleep duration | Short (≤2.25 h) | 50 (15.8) | Short (≤1.50 h) | 29 (10.1) | < 0.001 |
Intermediate (2.26–5.33 h) | 233 (73.5) | Medium (1.51–3.50 h) | 211 (73.8) | 0.428 | |
Long (> 5.33 h) | 34 (10.7) | Long (> 3.50 h) | 46 (16.1) | 0.009 | |
Total sleep duration per 24 h | Short (≤12 h) | 46 (14.6) | Short (≤11 h) | 34 (12.5) | 0.006 |
Intermediate (12.01–15.30 h) | 235 (74.6) | Medium (11.01-14 h) | 204 (73.1) | 0.351 | |
Long (> 15.30 h) | 34 (10.8) | Long (> 14 h) | 40 (14.3) | 0.010 | |
% daytime sleep duration / total sleep | Low (≤18.52%) | 33 (10.5) | Low (≤13%) | 31 (11.1) | 0.174 |
Intermediate (18.53–36%) | 248 (78.7) | Medium (13.01–27%) | 224 (80.3) | 0.202 | |
High (> 36%) | 34 (10.8) | High (> 27.01%) | 24 (8.6) | 0.008 | |
Frequency of night awakenings | Low (≤0.5times) | 33 (10.6) | Low (≤0times) | 31 (11.3) | 0.165 |
Intermediate (0.6-4times) | 245 (78.5) | Medium (0.1–3.50times) | 216 (78.5) | < 0.001 | |
High (>4times) | 34 (10.9) | High (> 3.50times) | 28 (10.2) | 0.004 | |
Time awake at night | Short (≤0 h) | 51 (16.9) | Short (≤0.01 h) | 28 (11.0) | < 0.001 |
Intermediate (0.01–0.75 h) | 214 (71.1) | Medium (0.02–0.83 h) | 186 (73.2) | 0.031 | |
Long (> 0.75 h) | 36 (12.0) | Long (> 0.83 h) | 40 (15.7) | 0.027 | |