Table 2. Weighted Probabilities of 1-Year Trajectories From a Given Year to the Next According to Insomnia Status at Baselinea.
| Insomnia status in given year | Insomnia status in following year, person-years (%) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Good sleeper at baseline | Subsyndromal insomnia at baseline | Insomnia syndrome at baseline | ||||||||||
| Good sleeper | Subsyndromal | Syndrome | Total | Good sleeper | Subsyndromal | Syndrome | Total | Good sleeper | Subsyndromal | Syndrome | Total | |
| Good sleeper | 4165 (82.4) | 672 (14.9) | 144 (2.7) | 4981 (100) | 612 (67.3) | 232 (27.2) | 61 (5.5) | 905 (100) | 126 (57.0) | 55 (23.0) | 37 (20.0) | 218 (100) |
| Subsyndromal | 405 (49.4) | 272 (42.5) | 71 (8.1) | 748 (100) | 506 (35.3) | 783 (50.9) | 221 (13.8) | 1510 (100) | 62 (18.1) | 152 (48.7) | 99 (33.2) | 313 (100) |
| Syndrome | 67 (28.1) | 62 (33.5) | 73 (38.5) | 202 (100) | 55 (17.9) | 105 (28.3) | 206 (53.8) | 366 (100) | 105 (10.3) | 222 (23.5) | 713 (66.2) | 1040 (100) |
a
Percentages are weighted according to sampling weights (see the Methods section). To calculate raw odds, if a good sleeper at baseline reported having subsyndromal insomnia in any given year during the study, the raw odds of reporting being a good sleeper in the next year instead of reporting a syndrome was 405/71 = 5.7. Thus, for each respondent with subsyndromal insomnia who reported a worsening of their condition (having insomnia syndrome in the next year), there were 5.7 respondents who reported an improvement of their condition (being a good sleeper in the next year).