Table 1. Characteristics of included patients.

	Controls	Cases	p
Age (years)*	10.9±5.2	10.9±5.7	0.98
Gender [% male (n)]	52.4 (22)	52.4 (22)	1
Tooth sensitivity (1) [% positive (n)]	4.8 (2)	63.6 (21)	0.02
Enamel defect [% positive (n)]	4.8 (2)	73.8 (31)	0.34
PI (%)*	11.4±9.5	29.1±28.7	<0.01
Mean MGI*	0.1±0.1	0.5±0.5	<0.01
Sites with MGI≥2 (%)*	0.5±1.2	11.9±16.7	<0.01

McNemar's test and pairwise t-test. (1) Nine cases have missing data for tooth sensitivity. *Mean±SD.