Parameter

Scalp region

Males (N = 1000)

Females (N = 993)

p-value

Effect size (Cohen’s D)

Mean

SD

Mean

SD

Positive parameters

Hair density (N/cm²)

Frontal

205.26

43.63

185.08

43.54

<0.001*

0.46

Occipital

187.43

36.89

184.39

42.53

0.089

0.08

AHST (μm)

Frontal

52.03

9.33

53.14

10.04

0.010*

0.11

Occipital

68.58

9.25

59.69

9.28

<0.001*

0.96

% thick hairs

Frontal

51.22

19.31

52.57

18.11

0.106

0.07

Occipital

78.80

11.95

66.45

16.09

<0.001*

0.87

Triple follicular units

Frontal

36.92

12.57

28.55

13.70

<0.001*

0.64

Occipital

47.52

13.11

40.60

14.36

<0.001*

0.50

CHT

Frontal

10.58

2.47

9.77

2.77

<0.001*

0.31

Occipital

12.79

2.64

10.93

2.65

<0.001*

0.70

NFU

Frontal

90.93

13.75

90.30

16.22

0.354

0.04

Occipital

74.01

12.31

77.86

13.91

<0.001*

0.29

Negative parameters§

% thin hairs

Frontal

16.07

11.72

18.62

11.68

<0.001*

0.22

Occipital

4.95

5.01

8.70

7.61

<0.001*

0.58

% mid hairs

Frontal

32.70

12.54

28.74

11.48

<0.001*

0.33

Occipital

16.12

8.60

24.77

11.35

<0.001*

0.86

Single follicular units

Frontal

26.62

10.41

33.07

13.09

<0.001*

0.55

Occipital

17.49

7.86

23.03

11.05

<0.001*

0.58

TDSS

Frontal

2.35

0.42

2.51

0.51

<0.001*

0.33

Occipital

2.02

0.35

2.30

0.44

<0.001*

0.72