BMI, BMI Z-scores and obesity prevalence across the three CFS/ME groups
| No ALSPAC (1) | Yes ALSPAC (2) | Specialist CFS/ME services (3) | Difference or OR (3 vs 1) | |
|---|---|---|---|---|
| CFS/ME status at 13 years | ||||
| n | 13 752 | 226 | 1685 | – |
| BMI (mean; SE) | 20.52 (0.04) | 20.33 (0.37) | 21.67 (0.40) | 1.15 (0.35 to 1.95) |
| Z-score (mean; SE) | 0.42 (0.01) | 0.34 (0.11) | 0.60 (0.10) | 0.18 (−0.12 to 0.37) |
| Obesity prev. (n; %) | 655 (4.18%) | 8 (3.72%) | 156 (9.28%) | OR: 2.31 (1.54 to 3.48) |
| CFS/ME status at 16 years | ||||
| n | 13 665 | 313 | 1685 | – |
| BMI (mean; SE) | 21.61 (0.05) | 21.86 (0.40) | 22.23 (0.80) | 0.62 (−0.97 to 2.21) |
| Z-score (mean; SE) | 0.46 (0.01) | 0.49 (0.11) | 0.77 (0.23) | 0.30 (−0.15 to 0.76) |
| Obesity prev. (n; %) | 609 (4.46) | 17 (5.46) | 277 (16.43) | OR: 4.07 (2.04 to 8.11) |
ALSPAC, Avon Longitudinal Study of Parents and Children; BMI, body mass index; CFS, chronic fatigue syndrome; ME, myalgic encephalomyelitis.