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Table 3 Comparison of outliers in primary variables in groups stratified by age, sex, side, BMI and type and severity of the deformity

From: Achieving coronal plane alignment in total knee arthroplasty through modified preoperative planning based on long-leg radiographs: a prospective study

Radiographic variable
Age ≤65 years, N = 144 > 65 years, N = 101 p value
 HKA axis, Outlier (%) 06, (4.16%) 04, (3.96%) 1.00
 mLDFA, Outlier (%) 05, (3.47%) 02, (1.98%) 0.70
 MPTA, Outlier (%) 01, (0.69%) 01, (0.99%) 1.00
Sex Male, N = 52 Female, N = 193  
 HKA axis, Outlier (%) 01, (1.92%) 09, (4.66%) 0.69
 mLDFA, Outlier (%) 00, (0.00%) 07, (3.62%) 0.35
 MPTA, Outlier (%) 01, (1.92%) 01, (0.51%) 0.38
Side Left, N = 116 Right, N = 129  
 HKA axis, Outlier (%) 05, (4.31%) 05, (3.87%) 1.00
 mLDFA, Outlier (%) 03, (2.58%) 01, (0.007%) 0.34
 MPTA, Outlier (%) 01, (0.86%) 04, (3.10%) 0.37
BMI ≤30 kg/m2, N = 124 > 30 kg/m2, N = 121  
 HKA axis, Outlier (%) 04, (3.22%) 06, (4.95%) 0.53
 mLDFA, Outlier (%) 03, (2.41%) 04, (3.30%) 0.71
 MPTA, Outlier (%) 01, (0.80%) 01, (0.83%) 1.00
Type severity of the deformity Varus, N = 227 Valgus, N = 18  
 HKA axis, Outlier (%) 10, (4.40%) 00, (0.00%) 0.61
 mLDFA, Outlier (%) 07, (3.08%) 00, (0.00%) 1.00
 MPTA, Outlier (%) 02, (0.88%) 00, (0.00%) 1.00
Severity of the varus deformity ≤150, N = 193 > 150, N = 34  
 HKA axis, Outlier (%) 07, (3.62%) 03, (8.82%) 0.17
 mLDFA, Outlier (%) 06, (3.10%) 01, (2.94%) 1.00
 MPTA, Outlier (%) 01, (0.51%) 01, (2.94%) 0.27