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Table 13 Comparison of number of childbirth experiences between groups

From: Vitamin D levels and bone mineral density of middle-aged premenopausal female football and volleyball players in Japan: a cross-sectional study

 

Non-exercise

Volleyball

Football

P-value b

(n = 25)

(n = 40)

(n = 27)

None

1

0

6

0.06

(0.0) a

(0.0)

(22.2)

1 time

2

6

3

(8.0)

(15.0)

(11.1)

2 times

17

21

11

(68.0)

(52.5)

(40.7)

3 times

4

12

6

(16.0)

(30.0)

(22.2)

> 4 times c

1

1

1

(4.0)

(2.5)

(3.7)

  1. a Number (%)
  2. b P: analysis of covariance
  3. c >4 times: more than 4 times
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BMC Sports Science, Medicine and Rehabilitation

ISSN: 2052-1847

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