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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
  1. Note: aResults from the reanalysis, the rest of the results are retrieved from the two original studies [1, 2]