Table 1.

Characteristics of participants by study

	Northland	Brunei	Brazil	Otago
Sample size	185	423	404	272
Age range	12-13	11-14	11-14	12-13
No of Females (%)	89 (48.2)	217 (51.3)	199 (49.3)	127 (46.7)
Mean DMFS (SD)	4.9 (5.2)	2.0 (3.8)	1.8 (2.1)a	1.8 (3.2)
Type of sample	Convenience	Convenience	Convenience	Convenience

^aSurface-level data were not available for the Brazil sample