“…There was no clear description of the person performing the clinical examination in three studies [18, 59, 62]. Data collection was by a single dentist in 17 studies [15, 16, 19, 20, 22, 24–27, 29, 30, 49, 58, 60, 61, 63, 65], two dentists in four studies [17, 21, 23, 64] and three dentists in one study [28] and methods varied for assessing and recording caries prevalence; the majority ( n = 16 studies) used the World Health Organisation (WHO) caries detection system [15–17, 19–23, 26, 28, 29, 49, 58, 63, 65, 66], whilst alternative indices (DMF, NIDR, Rradike (1972) and Moller & Poulsen) were used in nine others [18, 24, 25, 27, 30, 59–62]. The threshold for caries recording was generally poorly reported and variable where stated.…”