Table 1.
Frequency and prevalence of sleep problems by age group and year of questionnaire*
| Year of questionnaire [n (%)] | ||||||
|---|---|---|---|---|---|---|
| Age group | 2000 (n=159) | 2002 (n=189) | 2004 (n=203) | 2006 (n=208) | 2009 (n=221) | 2011 (n=220) |
| Any sleep problem | ||||||
| 0–7 years | 33 (94.3) | 29 (85.3) | 34 (94.4) | 31 (93.9) | 22 (91.7) | 31 (93.9) |
| 8–12 years | 40 (93.0) | 43 (81.1) | 40 (87.0) | 36 (81.8) | 39 (92.9) | 30 (79.0) |
| 13–17 years | 42 (97.7) | 46 (95.8) | 37 (78.7) | 40 (87.0) | 36 (83.7) | 32 (84.2) |
| 18+ years | 32 (88.9) | 48 (90.6) | 61 (88.4) | 71 (88.8) | 91 (85.5) | 79 (73.2) |
| Night laughing | ||||||
| 0–7 years | 21 (60.0) | 27 (79.4) | 28 (77.8) | 29 (87.9) | 20 (87.0) | 24 (75.0) |
| 8–12 years | 30 (69.8) | 33 (63.5) | 35 (76.1) | 26 (63.4) | 27 (67.5) | 23 (62.2) |
| 13–17 years | 33 (78.6) | 42 (87.5) | 34 (73.9) | 32 (72.7) | 30 (69.8) | 22 (57.9) |
| 18+ years | 23 (63.9) | 39 (72.2) | 44 (62.9) | 53 (66.3) | 61 (59.8) | 50 (49.0) |
| Night screaming | ||||||
| 0–7 years | 8 (22.9) | 18 (52.9) | 23 (63.9) | 20 (60.6) | 10 (43.5) | 17 (53.1) |
| 8–12 years | 14 (32.6) | 25 (47.2) | 23 (50.0) | 16 (37.2) | 18 (46.2) | 15 (40.5) |
| 13–17 years | 19 (46.3) | 23 (47.9) | 20 (44.4) | 17 (37.8) | 12 (27.9) | 10 (27.0) |
| 18+ years | 9 (26.5) | 28 (53.9) | 28 (39.4) | 32 (40.5) | 44 (42.7) | 39 (37.1) |
| Night waking | ||||||
| 0–7 years | - | - | - | 28 (93.3) | 20 (87.0) | 25 (89.3) |
| 8–12 years | - | - | - | 30 (79.0) | 33 (91.7) | 21 (72.4) |
| 13–17 years | - | - | - | 34 (85.0) | 29 (78.4) | 20 (71.4) |
| 18+ years | - | - | - | 57 (85.1) | 76 (78.4) | 55 (64.0) |
*
Prevalence was calculated based on sample size that excluded missing data