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Table 3 Comparison of frequency of play in the exercise group

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

 

Volleyball

Football

P-value b

(n = 40)

(n = 27)

< 1 time/month c

1

1

0.59

(2.5) a

(3.7)

2 times/month

3

2

(7.3)

(7.4)

3 times/month

0

1

(0.0)

(3.7)

< 1 time/week

12

7

(30.0)

(25.9)

2 times/week

14

11

(35.0)

(40.7)

3 times/week

5

5

(12.5)

(18.5)

4 times/week

3

0

(7.5)

(0.0)

> 5 times/week d

2

0

(5.0)

(0.0)

  1. a Number (%)
  2. b P: analysis of covariance
  3. c <1 time/month: less than 1 time
  4. d >5 times/week: more than 5 times