Table. Proportion of adequate reporting of the 22 items of the STREGA statement in the articles appraised within the four groups and comparison between the groups (A vs B, A vs C, B vs D).

STREGA	Group A	Group B	Group C	Group D
Item
1	100.0	83.3	94.4	61.1
2	100.0	100.0	100.0	100.0
3	100.0	100.0	94.4	100.0
4	100.0	100.0	100.0	100.0
5	83.3	77.8	77.8	77.8
6	61.1	66.7	38.9	72.2
7	38.9	16.7	5.6*	0.0
8	22.2	22.2	0.0*	11.1
9	44.4	22.2	11.1	16.7
10	61.1	11.1*	11.1*	100.0*
11	83.3	83.3	50.0*	0.0*
12	11.1	0.0	0.0	0.0
13	11.1	0.0	0.0	0.0
14	5.6	0.0	0.0	0.0
15	100.0	100.0	83.3	100.0
16	5.6	0.0	0.0	0.0
17	16.7	0.0	0.0	0.0
18	100.0	100.0	100.0	100.0
19	66.7	55.6	38.9	50.0
20	100.0	100.0	100.0	100.0
21	83.3	100.0	83.3	88.9
22	100.0	100.0	100.0	100.0
Total (95% CI)	63.0 (59.0–68.0)	56.0 (51.0–61.0)*	49.0 (45.0–54.0)*	54.0 (49.0–58.0)

CI, confidence interval; STREGA, The STrengthening the REporting of Genetic Association studies statement.

*P < 0.05; P-value calculated for each of these comparisons A vs B, A vs C, and B vs D.