Table 2 Means, SD in parentheses of the molar inclination angles and movement percentages at T1 and T2 and P values, 95% CI of intergroup differences (unpaired t-test): Ret, retention group; Non, non-retention group; *, Mann–Whitney U test

Measurement

Ret (n=30)

Non (n=35)

P value

95% CI

36-MP (°)

90.8 (4.9)

92.2 (6.9)

0.34

−1.54 to 4.40

37-MP (°)

91.1 (6.1)

91.2 (7.9)

0.97

−3.49 to 3.62

46-MP (°)

89.4 (5.2)

86.9 (5.5)

0.07

−5.11 to 0.22

47-MP (°)

89.0 (7.4)

85.7 (10.0)

0.13

−7.77 to 1.06

Measurement

Ret (n=30)

Non (n=35)

P value

95% CI

36-MP (°)*

89.9 (4.4)

91.9 (7.1)

0.09

−1.00 to 4.98

37-MP (°)*

90.7 (4.8)

91.4 (7.2)

0.62

−2.38 to 3.76

46-MP (°)

88.3 (6.5)

86.7 (7.2)

0.32

−4.72 to 1.56

47-MP (°)

87.5 (7.2)

86.1 (10.1)

0.53

−5.80 to 2.99