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Table 2 Intergroup comparison of the amount of root resorption at the end of treatment (Mann-Whitney tests)

From: External root resorption with the self-ligating Damon system—a retrospective study

Variable Group 1—Damon N = 25 Group 2—conventional N = 27 P
Mean (median) Interquartile deviation Mean (median) Interquartile deviation
EARR 12 0.72 (0.00) 1.00 0.70 (1.00) 1.00 0.978
EARR 11 0.72 (0.00) 1.00 0.59 (0.00) 1.00 0.653
EARR 21 0.88 (1.00) 1.00 0.66 (0.00) 1.00 0.480
EARR 22 0.80 (1.00) 1.00 0.74 (1.00) 1.00 0.595
EARR 32 0.56 (0.00) 1.00 0.55 (0.00) 1.00 0.833
EARR 31 0.60 (1.00) 1.00 0.62 (1.00) 1.00 1.000
EARR 41 0.64 (1.00) 1.00 0.66 (0.00) 1.00 0.869
EARR 42 0.48 (0.00) 1.00 0.40 (0.00) 1.00 0.673