Table 1 Cramêr’s Vs and odds ratios for the reanalysed studies
From: Comparing effects: a reanalysis of two studies on season of birth bias in anorexia nervosa
Sample origin | Sample N | Monthly deviations (11 df) | First vs. second half of the year (1 df) | March–June vs. the rest of the year (1 df) | September–October vs. the rest of the year (1 df) | March–June vs. September–October (1 df) |
|---|---|---|---|---|---|---|
Disanto et al. [1] | ||||||
UK | 1239 | Cramêr’s V (C) = 0.06a X 2 = 10.6 P = 0.49 | Odds ratio (OR) = 1.13 95% Confidence interval (CI) = 1.01–1.26 P = 0.025 | OR = 1.15 95% CI = 1.03–1.29 P = 0.012 | OR = 0.80 95% CI = 0.68–0.94 P = 0.007 | OR = 1.31 95% CI = 1.10–1.56 P = 0.001 |
Winje et al. [2] | ||||||
i) Iceland, Norway, Sweden | 815 | C = 0.05 X 2 = 4.60 P = 0.94 | OR = 0.96a 95% CI = 0.79–1.16 P = 0.68 | OR = 1.04a 95% CI = 0.86–1.27 P = 0.67 | OR = 1.00a 95% CI = 0.77–1.30 P = 1 | OR = 0.97a 95% CI = 0.73–1.30 P = 0.84 |
ii) UK | 706 | C = 0.05 X 2 = 2.85 P = 0.99 | OR = 1.10a 95% CI = 0.90–1.36 P = 0.34 | OR = 0.94a 95% CI = 0.76–1.17 P = 0.60 | OR = 0.99a 95% CI = 0.75 P = 0.92 | OR = 1.03a 95% CI = 0.76–1.41 P = 0.84 |
iii) Oregon, USA | 394 | C = 0.07 X 2 = 3.93 P = 0.97 | OR = 1.00a 95% CI = 0.76–1.33 P = 1 | OR = 1.06a 95% CI = 0.79–1.43 P = 0.69 | OR = 0.01a 95% CI = 0.63–1.32 P = 0.67 | OR = 0.89a 95% CI = 0.59–1.34 P = 0.57 |
iv) Australia | 382 | C = 0.08 X 2 = 4.90 P = 0.94 | OR = 1.11a 95% CI = 0.83–1.47 P = 0.49 | OR = 0.85a 95% CI = 0.63–1.15 P = 0.29 | OR = 1.17a 95% CI = 0.80–1.73 P = 0.42 | OR = 1.27a 95% CI = 0.83–1.95 P = 0.27 |
v) Brazil, Argentina | 485 | C = 0.06 X 2 = 3.65 P = 0.98 | OR = 0.96a 95% CI = 0.75–1.24 P = 0.75 | OR = 1.00a 95% CI = 0.76–1.31 P = 1 | OR = 0.93a 95% CI = 0.67–1.30 P = 0.68 | OR = 0.94a 95% CI = 0.65–1.37 P = 0.76 |
Europa (i & ii) | 1521 | C = 0.03 X 2 = 2.16 P = 0.99 | OR = 1.02a 95% CI = 0.89–1.18 P = 0.74 | OR = 0.99a 95% CI = 0.86–1.16 P = 1 | OR = 1.00a 95% CI = 0.82–1.20 P = 1 | OR = 1.00a 95% CI = 0.81–1.23 P = 1 |
Northern Hemisphere (i, ii & iii) | 1915 | C = 0.03 X 2 = 3.03 P = 0.99 | OR = 1.02a 95% CI = 0.90–1.16 P = 0.76 | OR = 1.01a 95% CI = 0.88–1.15 P = 0.88 | OR = 0.98a 95% CI = 0.82–1.16 P = 0.77 | OR = 0.96a 95% CI = 0.80–1.16 P = 0.68 |
Southern Hemisphere (iv & v) | 879 | C = 0.04 X 2 = 2.52 P = 0.99 | OR = 1.02a 95% CI = 0.84–1.23 P = 0.89 | OR = 0.93a 95% CI = 0.76–1.14 P = 0.48 | OR = 1.03a 95% CI = 0.80–1.32 P = 0.82 | OR = 1.07a 95% CI = 0.81–1.42 P = 0.62 |