Table 3.
Descriptive Statistics for Categorical Variables Among the Three Classes
| N = 140† | Partial-Responders (n = 97) | Initial-Responders (n = 25) | Optimal-Responders (n = 18) | χ2 (df), p |
|---|---|---|---|---|
| Group | ||||
|
| ||||
| Control: 71 (50.7) | 47 (48.5) | 13 (52.0) | 11 (61.1) | 0.99 (2), 0.61 |
| CBT-I: 69 (49.3) | 50 (51.5) | 12 (48.0) | 7 (38.9) | |
|
| ||||
| Sex | ||||
|
| ||||
| Male: 37 | 24 (24.7) | 6 (24.0) | 7 (38.9) | 1.65 (2), 0.44 |
| Female: 103 | 73 (75.3) | 19 (76.0) | 11 (61.1) | |
|
| ||||
| Race | ||||
|
| ||||
| White: 103 | 68 (70.1) | 20 (80.0) | 15 (83.3) | 2.01 (2), 0.37 |
| Non-white: 37 | 29 (29.9) | 5 (20.0) | 3 (16.7) | |
|
| ||||
| Partnered | ||||
|
| ||||
| Yes: 51 | 33 (34.4) | 10 (40.0) | 8 (44.4) | 0.81 (2), 0.67 |
| No: 88 | 63 (65.6) | 15 (60.0) | 10 (55.6) | |
|
| ||||
| Employed | ||||
|
| ||||
| Yes: 65 | 42 (43.8) | 13 (52.0) | 10 (55.6) | 1.18 (2), 0.55 |
| No: 75 | 54 (56.2) | 12 (48.0) | 8 (44.4) | |
|
| ||||
| Insomnia timing | ||||
|
| ||||
| Before depression: 61 | 41 (46.6) | 12 (50.0) | 8 (50.0) | 5.83 (6),0.44 |
| Same time: 24 | 13 (14.7) | 6 (25.0) | 5 (31.2) | |
| After depression: 43 | 34 (38.6) | 6 (25.0) | 3 (18.8) | |
|
| ||||
| Past insomnia episodes | ||||
|
| ||||
| None: 102 | 69 (71.1) | 19 (76.0) | 14 (82.4) | 1.04 (2), .60 |
| 1 or more: 37 | 28 (28.9) | 6 (24.0) | 3 (17.6) | |
|
| ||||
| Past depression episodes | ||||
|
| ||||
| None: 33 | 20 (21.5) | 9 (36.0) | 4 (25.0) | 2.58 (4), .63 |
| 1 or 2: 43 | 30 (32.3) | 7 (28.0) | 6 (37.5) | |
| 3 or more: 58 | 43 (46.2) | 9 (36.0) | 6 (37.5) | |
|
| ||||
| History of a chronic depressive episode | ||||
|
| ||||
| Absence: 53 | 29 (30.9) | 15 (60.0) | 9 (52.9) | 8.65 (2), .013 |
| Presence: 83 | 65 (69.1) | 10 (40.0) | 8 (47.1) | |
|
| ||||
| Remission at the end of treatment | ||||
|
| ||||
| Yes: 56 | 22 (22.7) | 17 (68.0) | 17 (94.4) | 42.52 (2), <.001 |
| No: 84 | 75 (77.3) | 8 (32.0) | 1 (5.6) | |
Note. n (%) are presented. Overall differences were tested using two-tailed Fisher's exact test.
†
Participants were excluded from analyses if their probability of being in the most likely class was < .5 (n = 6), or if the probabilities of the most and second most likely classes differ by < .2 (n = 2); sample sizes for “Partnered” and “Insomnia timeline” are 139 and 138 respective due to 1 and 2 individuals from Class 1 had missing data on these two variables. “Partnered”: “yes” = married or having live-in partners; “no”: single, divorced, separated, or widowed.