Table 1.
Relation between dependent variables and self reported chronic fatigue, criteria from the US Centers for Disease Control and Prevention (CDC) for chronic fatigue syndrome, and parental report of myalgic encephalomyelitis or chronic fatigue syndrome (multivariate analysis). Values are odds ratios (95% confidence intervals) unless otherwise indicated
| Self reported | CDC criteria | Parental report* | |
|---|---|---|---|
| No (%) of respondents | 24/4240 | 8/4240 | 4/10 438 |
| Prevalence (95% CI) | 0.57 (0.34 to 0.80) | 0.19 (0.06 to 0.32) | 0.038 (0.00 to 0.076) |
| Age† | 1.5 (1.1 to 2.1) | 1.9 (1.0 to 3.7) | 1.2 (0.9 to 1.8) |
| P<0.01 | P=0.03 | P=0.2 | |
| Female sex | 1.4 (0.6 to 3.3) | 0.8 (0.2 to 3.4) | 0.9 (0.1 to 7.1) |
| P=0.4 | P=0.8 | P=0.9 | |
| Mother's score on general health questionnaire† | 1.0 (0.9 to 1.2) | 1.2 (0.9 to 1.4) | 1.3 (1.0 to 1.6) |
| P=0.6 | P=0.1 | P=0.03 | |
| Any anxiety disorder | 3.7 (1.2 to 12.0) | 8.8 (1.8 to 43.5) | 4.6 (0.4 to 48.3) |
| P=0.03 | P=0.008 | P=0.2 | |
| Any depressive disorder | 2.8 (0.6 to 12.2) | 1.2 (0.1 to 12.3) | 0.0 (0.0 to 2.86×10−33) |
| P=0.1 | P=0.9 | P=0.8 |
*
Includes one child aged 6.
†
For continuous variables, odds ratios represent a one point shift on the scale.