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Table 1 Comparative study sample characteristics

From: Trichotillometry: the reliability and practicality of hair pluckability as a method of nutritional assessment

Participant characteristic

Black African n = 12

White n = 12

Hair pluckability Mean (SD)

Test statistic (P value)

Ethnicity (number):

    

   Black African

12

0

39.9 (10.8)

0.89 (0.372)1

   White Australian

0

1

38.7 (11.0)

 

   White British

0

9

38.7 (11.0)

 

   White German

0

1

38.7 (11.0)

 

   White Italian

0

1

38.7 (11.0)

 

Gender (number)

    

   Male

4

4

40.9 (11.2)

1.58 (0.115)1

   Female

8

8

38.5 (10.7)

 

Age (Mean (SD))

35.3 (9.1)2

36.7 (9.1)

36.0 (9.1)

0.083 (0.208)3

Age groups

    

   19–29 y

4

2

41.6 (12.5)

10.38 (<0.001)4

   30–40 y

3

6

35.4 (9.5)

 

   41–52 y

4

4

41.7 (10.0)

 

Age groups

    

   19–36 y

6

6

38.4 (11.6)

1.39 (0.187)1

   >36 y

5

6

40.2 (10.1)

 

Hair color (number):

    

   Black

11

1

39.7 (10.9)

0.157 (0.525)5

   Brown

0

8

38.9 (10.9)

 

   Blonde

0

2

38.9 (10.9)

 

   Grey

1

0

38.9 (10.9)

 

   Red

0

1

38.9 (10.9)

 

Hair length (number):

    

   Shorter than ear length

8

8

37.5 (32.5, 45.0)6

1.09 (0.579)5

   Between chin and shoulder

3

2

37.8 (29.9, 47.5)6

 

   Longer than shoulder

1

2

42.6 (29.7, 50.1)6

 

Hair currently permed

    

   Yes

7

0

40.2 (10.2)

0.78 (0.436)1

   No

4

12

38.9 (11.2)

 

Hair currently dyed

    

   Yes

2

7

41.4 (10.5)

1.90 (0.058)1

   No

10

4

38.4 (11.0)

 

Currently have hair products on hair

    

   Yes

7

6

39.5 (10.9)

0.25 (0.804)1

   No

4

6

39.1 (11.0)

 

Broken hair

    

   ≥1

3

1

41.4 (10.7)

-1.36 (0.177)1

   None

9

11

38.9 (10.9)

 
  1. 1Independent t-test, 2N = 11 as one participant did not report their age, 3Spearman's correlation, 4One-way ANOVA, 5Kruskal Wallis test, 6Median (Interquartile range)