Table 2.
Participant characteristics by nightmare status on the Nightmare Disorder Index
| Total sample (N = 460) | No nightmares (N = 224) | Subthreshold nightmare symptoms (N = 202) | Probable nightmare disorder (N = 34) | ||||
|---|---|---|---|---|---|---|---|
| n (% of sample) or M (SD) | n (% of column) or M (SD) | n (% of column) or M (SD) | n (% of column) or M (SD) | F or χ2 | p | Part. η2, φ, or V | |
| Age | 39.02 (11.08) | 40.19 (11.43) | 37.89 (10.69) | 38.06 (10.46) | 2.43 | 0.089 | .011 |
| Sex | 5.74 | 0.057 | .112 | ||||
| Male | 41 (8.9%) | 27 (12.0%) | 13 (6.4%) | 1 (2.9%) | |||
| Female | 419 (91.1%) | 197 (87.9%) | 189 (93.6%) | 33 (97.1%) | |||
| Race* | 0.46 | 0.794 | .032 | ||||
| White | 357 (77.6%) | 176 (78.6%) | 156 (77.2%) | 25 (73.5%) | |||
| Black/African American | 31 (6.7%) | 12 (5.4%) | 15 (7.4%) | 4 (11.8%) | |||
| Asian | 51 (11.1%) | 25 (11.2%) | 22 (10.9%) | 4 (11.8%) | |||
| Multiracial/other | 21 (4.6%) | 11 (4.9%) | 9 (4.5%) | 1 (2.9%) | |||
| Ethnicity+ | 0.91 | 0.633 | .045 | ||||
| Hispanic/Latino | 47 (10.3%) | 22 (9.8%) | 20 (9.9%) | 5 (14.7%) | |||
| Not Hispanic/Latino | 410 (89.7%) | 200 (89.3%) | 182 (90.0%) | 28 (82.4%) | |||
| Marital status | 7.53 | 0.110 | .090 | ||||
| Married | 282 (61.3%) | 137 (61.2%) | 131 (64.9%) | 14 (41.2%) | |||
| Single | 125 (27.2%) | 59 (26.3%) | 51 (25.2%) | 15 (44.1%) | |||
| Divorced/separated/ widowed | 53 (11.5%) | 28 (12.5%) | 20 (9.9%) | 5 (14.7%) | |||
| Children | 4.82 | 0.090 | .102 | ||||
| No children | 167 (36.3%) | 70 (31.3%) | 83 (41.1%) | 14 (41.2%) | |||
| Has children | 293 (63.7%) | 154 (68.8%) | 119 (58.9%) | 20 (58.8%) | |||
| Number of children | 1.36 (1.28) | 1.47 (1.24) | 1.22 (1.29) | 1.41 (1.46) | 2.00 | 0.137 | .009 |
| Work schedule+ | 10.58 | 0.005 | .153 | ||||
| Day shift only | 292 (64.3%) | 140 (62.5%) | 138 (68.3%)a | 14 (41.2%)a | |||
| Night or rotating | 162 (35.7%) | 82 (36.6%) | 60 (29.7%)b | 20 (58.8%)b |
Note. +For these measures, n = 457, n = 454 due to missing data.
*Due to small cell sizes, statistical comparison for race was collapsed to white vs. other.
abNonmatching letter pairs within columns indicate significantly different observed value than expected for post hoc comparisons (adjusted standardized residuals).