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Table 7 Comparison of dental caries level in different geographic population

From: Longitudinal measurement invariance and explanatory IRT models for adolescents’ oral health-related quality of life

Age range Population Dental caries level Study
Non‑Significant relationship to OHRQoL
 12, 15,18 Hong Kong Mean DMFT at age 12,15 and 18 = 0.6, 1.1, 1.5 respectively [29]
 12‑13 Dunedin, New Zealand Mean DMFS = 1.6 [26]
DMFS> 0 = 44.2%
Significant relationship to OHRQoL
 14‑17 Santa Catarina State, Brazil Mean DMFT = 5.4 [30]
DMFT> 0 = 88.2%
 11‑13 Iran Mean DMFT = 1.8 [31]
 12 & 15 Modinagar, India DMFT> 0 = 63% [32]
 12 & 15 Thailand Mean DMFT =1.3‑2.1 (12 years old), Mean DMFT = 1.9‑2.9 (15 years old) in different regions [33]
 15‑19 Brazil general population > 0 untreated caries = 46.1% [34]
 10‑14 Thailand Mean DMFT = 1.97 (Association found only in 6 month follow‑up) [21]