Table 7

Correlation of number of systemic diseases and general health with subscales

SubscaleNo of systemic diseasesGeneral health
OverallAge*Vision†
Correlation coefficient‡p ValueCorrelation coefficient‡p ValueCorrelation coefficient§p ValueCorrelation coefficient§p Value
General health−0.250.056
General vision−0.060.6650.280.0370.300.0450.320.031
Near vision−0.020.8540.130.2910.160.2920.170.253
Distance vision0.050. 6250.190.1250.230.1250.250.099
Driving0.070.5840.140.2530.180.2480.200.180
Peripheral vision0.020.8940.300.0230.360.0160.340.020
Colour vision0.340.012−0.020.889-0.010.965-0.040.773
Ocular pain0.010.9420.070.5540.090.5570.090.574
Role difficulties0.060.645−0.040.768−0.040.778−0.040.810
Dependency0.090.4800.230.0870.280.0660.270.071
Social functioning0.110.3810.150.2500.170.2590.170.253
Mental health0.080.5190.130.2930.180.2410.180.227
  • * Controlling for age.

  • Controlling for vision in the better-seeing eye.

  • Kendall tau-b.

  • § Spearman rank correlation.

  • Bold indicates values that are statistically significant (p < 0.05).