Table 3. Mobile phone use and the Risks of NSP and LBP in High School Students.

	N	% With NSP	P Value	NSP OR (95% CI)	% With LBP	P Value	LBP OR (95% CI)
Mobile phone use			0.79			0.01
No	441	40.1%		1	38.5%		1
Yes	2575	40.9%		1.03 (084-1.27)	32.2%		0.76 (0.61-0.93)
Posture while using a mobile phone
Standing	1001	42.0%	0.37	1.08 (0.92-1.27)	35.8%	0	1.31 (1.11-1.55)
Lying	755	46.9%	0	1.42 (1.20-1.68)	35.9%	0	1.27 (1.06-1.52)
Semi-reclining	732	42.1%	0.45	1.07 (0.90-1.28)	31.8%	0.85	0.98 (0.82-1.18)
Sitting	1224	35.9%	0	0.67 (0.58-0.79)	30.4%	0.07	0.86 (0.73-1.01)
Average daily mobile phone use time			0			0
< 1 h	1069	38.4%		1	27.0%		1
1 h-1.5 h	724	42.1%		1.17 (0.97-1.42)	34.8%		1.44 (1.18-1.77)
1.5 h-2 h	321	35.8%		0.90 (0.69-1.16)	31.2%		1.22 (0.93-1.60)
> 2 h	461	48.2%		1.493 (1.20-1.86)	40.6%		1.84 (1.46-2.32)
Eye-to-screen distance while using mobile phone			0.02			0
< 10 cm	432	46.5%		1	42.4%		1
10 cm-15 cm	1053	38.7%		0.72 (0.58-0.91)	28.8%		0.55 (0.44-0.69)
15 cm-20 cm	541	42.7%		0.86 (0.66-1.11)	28.7%		0.55 (0.42-0.71)
> 20 cm	549	38.8%		0.73 (0.56-0.94)	34.1%		0.70 (0.54-0.91)

NSP = neck/shoulder pain; LBP = lower back pain; OR = ORs after univariate logistic regression.