Table 2

Multivariate linear regression analysis for knowledge

KnowledgeUnivariate analysisMultivariate analysis
β (95% CI)P valueβ (95% CI)P value
R2=0.0570*
F=12.68 (p<0.001)
Sex
 MaleRef†–Ref–
 Female1.73 (−0.36, 3.83)0.106
Age (years)
 ≤20Ref–Ref–
 21–300.03 (−2.58, 2.66)0.978
 >30−2.64 −5.84, 0.54)0.104
Registered residence
 Agricultural household registrationRef–Ref–
 Non-agricultural household registration0.92 (−1.0, 2.85)0.351
Education level
 Senior middle school or lowerRef–Ref–
 Junior college/college5.80 (2.45, 9.14)0.0015.81 (2.52, 9.09)0.001
 Postgraduate or higher7.42 (3.34, 11.4)<0.0017.83 (3.83, 11.8)<0.001
Occupation, N (%)
 Government administrators of the country or leaders of enterprises and public institutionsRef–Ref–
 Professionals (teachers, engineering technicians, writers, etc)1.99 (−3.14, 7.13)0.445
 Clerks or relevant personnel0.80 (−5.34, 6.96)0.796
 Personnel in commercial business or service0.79 (−4.68, 6.27)0.776
 Personnel in farming, forestry, animal husbandry, fishery, etc0.41 (−6.78, 7.61)0.91
 Operators of production or transportation equipment, or relevant personnel——
 Army personnel−5.41 (−19.5, 8.72)0.452
 Housewife0.13 (−8.88, 9.16)0.976
 Personnel in the medical and relevant industry2.65 (−3.81, 9.13)0.421
 Others−1.05 (−5.96, 3.86)0.674
Monthly income per capita (Yuan)
 ≤5000Ref–Ref–
 5000–100001.09 (−1.90, 4.10)0.473
 10 000–200002.61 (−0.50, 5.72)0.101
 ≥20 0002.14 (−1.40, 5.69)0.235
Daily screen usage time (h)
 <4Ref–Ref–
 4–6−0.09 (−2.98, 2.79)0.949
 >60.48 (−2.15, 3.13)0.716
Surveyed before or after refractive error surgery
 BeforeRef–Ref–
 After4.97 (2.88, 7.06)<0.0015.09 (3.02, 7.16)<0.001

  • *Adjusted R-squared.

  • †Ref—variable used as a reference in the analysis.