Table S1: Descriptive statistics and sex wise difference of the nasal angles in 500 subjects using Repeated Measures ANOVA Nasal angles (Measurements taken thrice) Sex N Mean SD t-value p-value

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Table S1: Descriptive statistics and sex wise difference of the nasal angles in 500 subjects using Repeated Measures ANOVA

Nasal angles

(Measurements taken thrice)

Sex N Mean SD t-value p-value

Inter-alar angle_1 Male 250 77.8468 6.29591 -5.03 .001*

Female 250 80.5230 5.59084

Inter-alar angle _2 Male 250 77.9665 6.30938 -4.92 .001*

Female 250 80.5852 5.56948

Inter-alar angle _3 Male 250 77.9051 6.33042 -4.99 .001*

Female 250 80.5622 5.55859

Nasal prominence angle _1 Male 250 21.4922 7.26484 0.49 0.63 Female 250 21.2144 5.34761

Nasal tip angle _1 Male 250 95.6413 8.22222 -4.32 .001*

Female 250 98.6402 7.28759

Female 250 98.7005 7.28573

Female 250 98.3248 9.04913 P < .001: Significant

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Table S2: Test of significance for inter-alar angle

Using Multivariate Pillai’s Trace Test

Effect Value F Hypothesis

df Error df p-value Partial Eta Squared Inter-alar angle Pillai's Trace .020 5.151^b 2.000 497.000 .006 .020 Inter-alar angle *

gender Pillai's Trace .002 .446^b 2.000 497.000 .640 .002

Using Mauchly’s test of sphericity Within Subjects

Effect Mauchly's W Approx. Chi-

Square Df p-value Epsilon^b

Greenhouse-Geisser

Inter-alar angle .860 74.848 2 .0001 .877

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Table S3: The Within- and Between- Subjects effects for the inter-alar angle with respect to the sexes Within-Subjects

Source Type III

Sum of Squares

Df Mean

Square F p-value

Inter-alar angle Sphericity Assumed 2.069 2 1.035 5.200 .006

Greenhouse-Geisser 2.069 1.755 1.179 5.200 .008

Inter-alar angle * sex Sphericity Assumed .214 2 .107 .539 .584

Greenhouse-Geisser .214 1.755 .122 .539 .561

Between-Subjects

Source Type III Sum of

Squares Df Mean

Square F p-value Partial Eta

Squared

Intercept 9416437.965 1 9416437.965 88876.346 0.0001 .994

Sex 2634.763 1 2634.763 24.868 .0001 .048

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Table S4: Test of Significance for nasal prominence angle Using Multivariate Pillai’s Trace Test

df Error df Sig. Partial Eta

Squared Nasal_prominence

angle Pillai's

Trace .002 .465^b 2.000 497.000 .628 .002

Nasal_prominence

angle* sex Pillai's

Trace .005 1.155^b 2.000 497.000 .316 .005

Using Mauchly’s Test of Sphericity Within Subjects

Effect Mauchly's W Approx. Chi-

Square Df p-value Epsilon^b

Greenhouse- Geisser

Nasal_prominence .214 766.766 2 .0001 .560

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Table S5: The Within- and Between- Subjects effects for the nasal prominence angle w.r.t. the sex Within-Subjects

Df Mean

Square F p-value Partial Eta Squared

Nasal_prominence

angle Sphericity

Assumed .323 2 .161 .558 .572 .001

Greenhouse-

Geisser .323 1.120 .288 .558 .474 .001

Nasal_prominence

angle * sex Sphericity

Assumed .439 2 .220 .760 .468 .002

Greenhouse-

Geisser .439 1.120 .392 .760 .398 .002

Between-Subjects

Source Type III Sum

of Squares Df Mean Square F Sig. Partial Eta Squared

Intercept 683061.390 1 683061.390 5618.295 .000 .919

Sex 30.785 1 30.785 .253 .615 .001

Error 60545.877 498 121.578

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Table S6: Test of Significance for nasal tip angle

Using Multivariate Pillai’s Trace Test

df Error df p-value Partial Squared Eta Nasal_tip angle Pillai's Trace .002 .413^b 2.000 497.000 .662 .002 Nasal_tip angle

* sex Pillai's Trace .005 1.245^b 2.000 497.000 .289 .005

Using Mauchly’s Test of Sphericity Within Subjects

Effect Mauchly's W Approx.

Chi-Square Df Sig. Epsilon^b

Greenhouse-Geisser

Nasal_tip angle .077 1273.707 2 .0001 .520

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Table S7: The Within- and Between- Subjects effects for the nasal tip angle w.r.t. the gender

Within- Subjects

df Mean Square F p-value Partial

Squared Eta

Nasal_tip

angle Sphericity

Assumed 5.702 2 2.851 .409 .664 .001

Greenhouse-

Geisser 5.702 1.040 5.482 .409 .531 .001

Nasal_tip

angle* sex Sphericity

Assumed 15.947 2 7.973 1.145 .319 .002

Greenhouse-

Geisser 15.947 1.040 15.332 1.145 .288 .002

Between- Subjects

Source Type III Sum of

Squares Df Mean Square F p-value Partial Eta

Squared

Intercept 14145050.373 1 14145050.373 77759.118 0.0001 .994

Sex 3139.787 1 3139.787 17.260 .0001 .033

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Table S8: Discriminant function coefficients and its predicted accuracy

Discriminant Function Coefficient for mean nasal angles

(n=500) Discriminant Function Coefficient sex-wise (M=250, F=250)

Nasal Angles Function Gender Function

1 1

Mean Inter-alar angle .110 Male -.347

Mean Prominence angle .137

Mean Nasal tip angle .153 Female .347

Constant -26.484

Predicted Accuracy of the Final Model

Sex Predicted Group Membership

Total

Male Female

Original Count Male Female Percentage Male

Female

159 89

250 250

63.6 100.0 100.0

35.6 100.0 100.0

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Table S9: Comparative mean and S.D. values for all the three nasal angles in both the sexes

Sex Mean Std.

Deviation Valid N (listwise) Unweighted Weighted

Male Mean_Inter-alar 77.906133 6.2969823 250 250.000

Mean_prominence 21.482760 7.2616544 250 250.000 Mean_nasal_tip 95.661573 8.2272326 250 250.000

Female Mean_Interalar 80.556800 5.5660817 250 250.000

Total Mean_Interalar 79.231467 6.0832458 500 500.000

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Table S10: p-values for the mean of all the three nasal angles

Nasal Angles Wilks' Lambda F df1 df2 p-value

Mean_Interalar .952 24.868 1 498 .0001

Mean_prominence .999 .253 1 498 .615

Mean_nasal_tip .967 17.260 1 498 .0001

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Table S11: Comparison of the values of the nasal angles of the present study with a previous study Study/Author Population No. of subjects Inter-alar angle Nasal prominence

angle Nasal tip angle Males Females Males Females Males Females Males Females Sforza et al⁴³ White Italians

(18-30 yrs.)

192 94 75.43 74.45 20.06 20.19 93.84 94.99

Present study North Indians (18-35 yrs.)

250 250 74.81 82.15 37.17 20.96 74.37 99.04