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Table 3 Paired t test for comparing the dental and skeletal changes after class II elastics phase for the mini-implant group

From: The efficiency of mandibular mini-implants in reducing adverse effects of class II elastics in adolescent female patients: a single blinded, randomized controlled trial

Variable     Paired differences t P value  
  Mean SD Mean SD SEM
SNA Pre 82.78 3.00 − 1.12 2.50 0.72 − 1.55 0.14986 P > 0.05 NS
Post 81.67 3.42
SNB Pre 76.54 2.79 − 0.79 2.39 0.69 − 1.15 0.27516 P > 0.05 NS
Post 75.75 3.02
ANB Pre 6.20 1.47 − 0.37 0.79 0.23 − 1.62 0.13415 P > 0.05 NS
Post 5.83 1.11
MMP Pre 29.85 3.74 0.32 2.83 0.82 0.39 0.70541 P > 0.05 NS
Post 30.17 3.49
MP/SN Pre 38.68 4.67 0.37 2.13 0.62 0.60 0.56311 P > 0.05 NS
Post 39.04 4.50
Y axis angle Pre 56.85 3.35 2.15 1.32 0.38 5.62 0.00015 P < 0.001 HS
Post 59.00 2.98
Lower facial height Pre 62.53 3.60 2.13 2.20 0.64 3.36 0.00637 P < 0.01 HS
Post 64.67 4.64
Effective maxillary length Pre 84.13 4.57 0.70 3.00 0.87 0.81 0.43606 P > 0.05 NS
Post 84.83 4.32
Effective mandibular length Pre 106.37 5.26 1.97 4.31 1.24 1.58 0.14184 P > 0.05 NS
Post 108.33 5.65
SN/occlusal plane Pre 16.54 3.52 4.12 2.18 0.63 6.55 0.00004 P < 0.001 HS
Post 20.66 4.11
U1 vertical position Pre 20.73 2.89 1.06 2.31 0.67 1.59 0.14071 P > 0.05 NS
Post 21.79 1.95
U1 AP position Pre 13.18 3.00 − 4.35 2.99 0.86 − 5.04 0.00038 P < 0.001 HS
Post 8.83 2.48
U1 inclination Pre 115.94 2.04 − 8.57 6.45 1.86 − 4.60 0.00076 P < 0.001 HS
Post 107.38 5.48
U6 AP position Pre 44.17 6.10 − 3.29 6.38 1.84 − 1.79 0.10161 P > 0.05 NS
Post 40.88 4.86
U6 vertical position Pre 15.13 2.11 0.58 0.91 0.26 2.22 0.04819 P < 0.05 S
Post 15.71 2.08
L1 inclination Pre 99.88 4.80 4.45 1.47 0.42 10.52 0.00000 P < 0.001 HS
Post 104.33 4.12
L1 AP position Pre 4.78 1.19 1.03 1.63 0.47 2.18 0.05173 P ≈ 0.05 Almost S
Post 5.81 1.59
L1 vertical position Pre 31.68 2.36 0.87 2.02 0.58 1.49 0.16480 P > 0.05 NS
Post 32.54 3.20
L6 vertical Pre 22.14 2.17 1.19 0.84 0.24 4.93 0.00045 P < 0.001 HS
Post 23.33 1.83
L6 AP position Pre 42.18 4.47 2.98 3.82 1.10 2.71 0.02043 P < 0.05 S
Post 45.17 3.69