Testosterone And Grasp Reflex

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Total sample Table 3 presents the mean testosterone levels for the right-, left-, and mixed-handed participants for the grasp reflex in human neonates (unpublished observations). For the free testosterone levels, the difference between groups did not reach a traditional level of significance, F (2, 55) =2.56, p < .10. The left-handers had the lowest mean testosterone level, which was significantly less than that of the right-handers, t (35) = 2.23, p < .OS, and mixed-handers, t (31) = 2.01, p < .05. For the total testosterone levels, the difference between groups was also statistically significant, F (2, 55) = 3.34, p < .05. The right-handers had the highest testosterone level followed by the mixed-handers and the left-handers.

Table 3. The mean testosterone levels in right- (RH), left- (LH), and mixed-handed (MH) neonates

Participants

N

free testos. (Ng/dL)

SD

tot. testos. (Ng/dL)

SD

RHs

25

7.81

4.21

127.1

62.7

LHs

12

4.88

2.44

77.3

38.2

MHs

21

8.44

5.55

124.0

60.4

RH male

17

8.26

4.42

127.8

57.1

LH male

4

6.79

3.56

107.2

50.9

MH male

11

9.87

5.47

153.3

57.0

RH fem.

8

6.78

3.27

124.0

67.4

LH fem.

8

3.93

1.38

62.3

18.5

MH fem.

10

6.67

5.43

90.9

59.3

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