Table 1

Comparative study sample characteristics

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)


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)

Wyness et al. Nutrition Journal 2007 6:9   doi:10.1186/1475-2891-6-9

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