“…The methodological quality score for the 19 estimates of the prevalence of radiographic hip OA reported in the 16 primary studies [1, 3, 5, 7, 9, 19, 23, 27-30, 43, 44, 47, 54, 55] (three of which [29,43,55] reported on two separate cohorts each) uncovered in this review had a mean of 4.9 with a standard deviation of 0.9, a median of 5.0, and a range from 3.0 to 7.0 (Table 9). Only five of these estimates from four studies [9,[27][28][29] were considered of lower methodological quality (ie, score of 4 or lower), whereas 14 estimates from 12 studies [1,3,5,7,19,23,30,43,44,47,54,55] were considered of higher methodological quality (ie, score of 5 or higher). The mean prevalence reported in studies of lower methodological quality was 5.9% with a standard deviation of 4.0% and a median of 5.3% compared with a mean of 7.4%, a standard deviation of 6.4%, and a median of 6.7% for studies of higher methodological quality.…”