Table 2. PC 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) | |
|---|---|---|---|---|---|---|---|
| Average daily PC use time | 0.21 | 0.03 | |||||
| < 0.5 h | 1452 | 40.6% | 1 | 32.3% | 1 | ||
| 0.5 h-1 h | 660 | 37.9% | 0.89 (0.74-1.08) | 29.8% | 0.89 (0.73-1.09) | ||
| 1 h-1.5 h | 528 | 42.2% | 1.07 (0.87-1.31) | 36.2% | 1.19 (0.96-1.46) | ||
| > 1.5 h | 376 | 44.1% | 1.16 (0.92-1.45) | 37.5% | 1.26 (0.99-1.59) | ||
| I sat in front of a PC without moving much for more than 1.5 h | 0.01 | 0.08 | |||||
| No | 1812 | 38.9% | 1 | 31.8% | 1.15 (0.99-1.34) | ||
| Yes | 1204 | 43.6% | 1.22 (1.05-1.41) | 35.0% | 1.15 (0.99-1.34) | ||
| Type of PC used | 0 | 0 | |||||
| Laptop | 1145 | 45.3% | 1 | 36.6% | 1 | ||
| Desktop | 1871 | 38.5% | 0.76 (0.65-0.88) | 31.2% | 0.79 (0.67-0.92) | ||
| Height of the PC screen | 0.41 | 0.1 | |||||
| Eyes above the midpoint of screen | 799 | 41.4% | 1 | 34.5% | 1 | ||
| Eyes approximate the midpoint of screen | 2006 | 40.1% | 0.95 (0.80-1.12) | 32.0% | 0.90 (0.75-1.06) | ||
| Eyes below the midpoint of screen | 211 | 44.5% | 1.14 (0.84-1.54) | 38.4% | 1.18 (0.86-1.62) | ||
| Eye-to-screen distance while using a PC | 0 | 0.07 | |||||
| < 20 cm | 280 | 36.4% | 1 | 39.3% | 1 | ||
| 20 cm-25 cm | 832 | 36.7% | 1.01 (0.76-1.34) | 31.1% | 0.70 (0.53-0.93) | ||
| 25 cm-30 cm | 1051 | 44.3% | 1.39 (1.06-1.83) | 32.3% | 0.74 (0.56-0.97) | ||
| > 30 cm | 853 | 41.7% | 1.25 (0.95-1.65) | 34.0% | 0.80 (0.60-1.05) |
NSP = neck/shoulder pain; LBP = lower back pain; OR = ORs after univariate logistic regression.