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Table 5 Relationship between five factors and OSI for girls

From: A cross-sectional survey of factors influencing bone mass in junior high school students

 

Girls who had reached menarche

Girls who had not reached menarche

12 years old (N = 461)

13 years old (N = 1,565)

14 years old (N = 1,367)

15 years old (N = 791)

12–15 years old (N = 585)

N (%)

OSI

N (%)

OSI

N (%)

OSI

N (%)

OSI

N (%)

OSI

Body mass index (kg/m2)

 −18.4

160 (34.7)

2.62 ± 0.21

534 (34.1)

2.67 ± 0.28

344 (25.2)

2.72 ± 0.29

159 (20.1)

2.74 ± 0.28

499 (85.3)

2.55 ± 0.24

 18.5–24.9

286 (62.0)

2.71 ± 0.27

970 (62.0)

2.80 ± 0.29

944 (69.1)

2.87 ± 0.32

571 (72.2)

2.88 ± 0.31

83 (14.2)

2.61 ± 0.25

 25.0–

15 (3.3)

3.00 ± 0.41

61 (3.9)

2.95 ± 0.36

79 (5.8)

3.06 ± 0.32

61 (7.7)

2.99 ± 0.31

3 (0.5)

2.26 ± 0.09

 P value*

 

<0.001

 

<0.001

 

<0.001

 

<0.001

 

0.010

Exercise habits

 None

126 (27.3)

2.63 ± 0.28

354 (22.6)

2.64 ± 0.27

302 (22.1)

2.73 ± 0.30

198 (25.0)

2.77 ± 0.28

103 (17.6)

2.46 ± 0.22

 PS or current

175 (38.0)

2.70 ± 0.26

586 (37.4)

2.76 ± 0.30

447 (32.7)

2.83 ± 0.31

256 (32.4)

2.85 ± 0.30

215 (36.8)

2.50 ± 0.21

 PS and current

160 (34.7)

2.72 ± 0.25

625 (39.9)

2.83 ± 0.30

618 (45.2)

2.92 ± 0.33

337 (42.6)

2.93 ± 0.32

267 (45.6)

2.63 ± 0.25

 P value*

 

0.013

 

<0.001

 

<0.001

 

<0.001

 

<0.001

Milk intake per day during PS (mL)

 <200

238 (51.6)

2.67 ± 0.26

781 (49.9)

2.74 ± 0.30

734 (53.7)

2.83 ± 0.31

436 (55.1)

2.83 ± 0.30

299 (51.1)

2.53 ± 0.25

 200–400

166 (36.0)

2.71 ± 0.27

583 (37.3)

2.77 ± 0.31

470 (34.4)

2.85 ± 0.33

265 (33.5)

2.89 ± 0.32

219 (37.4)

2.57 ± 0.23

 >400

57 (12.4)

2.72 ± 0.28

201 (12.8)

2.81 ± 0.31

163 (11.9)

2.92 ± 0.37

90 (11.4)

2.93 ± 0.33

67 (11.5)

2.61 ± 0.21

 P value*

 

0.158

 

0.010

 

0.005

 

0.007

 

0.026

Current milk intake per day (mL)

 <200

242 (52.5)

2.66 ± 0.24

774 (49.5)

2.73 ± 0.30

719 (52.6)

2.83 ± 0.32

419 (53.0)

2.84 ± 0.29

306 (52.3)

2.54 ± 0.25

 200–400

159 (34.5)

2.72 ± 0.29

578 (36.9)

2.78 ± 0.31

461 (33.7)

2.85 ± 0.32

262 (33.1)

2.89 ± 0.33

214 (36.6)

2.57 ± 0.23

 >400

60 (13.0)

2.73 ± 0.29

213 (13.6)

2.80 ± 0.30

187 (13.7)

2.90 ± 0.37

110 (13.9)

2.92 ± 0.32

65 (11.1)

2.60 ± 0.23

 P value*

 

0.045

 

0.002

 

0.017

 

0.015

 

0.166

Bone fracture during the preceding year

 Yes

26 (5.6)

2.74 ± 0.35

69 (4.4)

2.85 ± 0.37

52 (3.8)

2.94 ± 0.30

45 (5.7)

2.95 ± 0.31

24 (4.1)

2.64 ± 0.25

 No

435 (94.4)

2.69 ± 0.26

1,496 (95.6)

2.76 ± 0.30

1,315 (96.2)

2.84 ± 0.33

746 (94.3)

2.86 ± 0.31

561 (95.9)

2.55 ± 0.24

 P value**

 

0.347

 

0.049

 

0.028

 

0.046

 

0.091

  1. OSI values are presented as mean ± standard deviation
  2. OSI osteo-sono assessment index, PS primary school
  3. * One-way analysis of variance, ** Student’s t test
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Environmental Health and Preventive Medicine

ISSN: 1347-4715

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