Table 1.
Prevalence of Duration-Based Insomnia Subtypes
| 1-month insomnia | 2- to 3-week insomnia | RBI | OBI | No insomnia | |
|---|---|---|---|---|---|
| Cumulative prevalence observed in study samplea | |||||
| Total (n = 591) | 144 (24.4) | 78 (13.2) | 143 (24.2) | 94 (15.9) | 132 (22.3) |
| Men (n = 292) | 51 (17.5) | 35 (12.0) | 83 (28.4) | 48 (16.4) | 75 (25.7) |
| Women (n = 299) | 93 (31.1) | 43 (14.4) | 60 (20.1) | 46 (15.4) | 57 (19.1) |
| Cumulative weighted prevalenceb | |||||
| Total | 19.8 | 9.7 | 20.6 | 17.5 | 32.4 |
| Men | 12.0 | 7.6 | 22.6 | 19.8 | 38.0 |
| Women | 27.4 | 11.9 | 18.6 | 15.2 | 27.0 |
| Weighted prevalence by age, in yearsc | |||||
| 20 or 21 (n = 591)d | 2.3 | 7.0 | 15.8 | 15.3 | 59.5 |
| 22 or 23 (n = 456)d | 4.2 | 4.2 | 14.8 | 13.2 | 63.5 |
| 27 or 28 (n = 457)d | 5.8 | 5.8 | 6.0 | 17.3 | 65.0 |
| 29 or 30 (n = 424)d | 6.2 | 4.1 | 18.9 | 18.7 | 52.1 |
| 34 or 35 (n = 407)d | 13.9 | 2.7 | 11.4 | 7.5 | 64.4 |
| 40 or 41 (n = 367)d | 5.5 | 8.4 | 24.7 | 12.4 | 49.0 |
Cells refer to the number (%) of subjects having this as their most persistent insomnia duration subtype observed across all interviews.
Weighted population prevalence corrected for stratified sampling. Numbers in each cell represent the estimated percentage of the total population having this as the most persistent insomnia duration subtype observed across all interviews.
Weighted population prevalence corrected for stratified sampling. Numbers in each cell represent the estimated percentage of the total population having this insomnia duration subtype at a particular age.
n = Actual number of subjects included in interviews at each age.
RBI refers to recurrent brief insomnia; OBI, occasional brief insomnia.