Table 2.

Dental treatment and amalgam exposure at the end of the 5-year follow-up period, by treatment group [mean ± SD (range)].

Dental treatment	Amalgam	Composite
No. of restored surfaces in mouth	5.3 ± 5.2 (0–36)*	6.1 ± 6.0 (0–36)*
No. of restored amalgam surfacesa	4.0 ± 4.0 (0–21)	0.05 ± 0.6 (0–9)
Cumulative no. of surfaces restored (over 5 years)b	14.8 ± 9.5 (2–55)**	16.0 ± 9.8 (2–51)**
Cumulative no. of surfaces restored with amalgamb	11.7 ± 7.0 (0–35)	0.05 ± 0.6 (0–9)

^aTwo children in the composite group received amalgam restorations from an out-of-study dentist.

^bCumulative numbers do not include children who withdrew from the study.

^*p = 0.16 for difference between amalgam and composite groups.

^**p = 0.10 for the difference between amalgam and composite groups.