Table 1

Time trade-off utility values for the NLP, LP-CF, and 20/200–20/400 groups

Group Mean utility SD 95% CI p Value p Value
NLP0.260.080.19–0.33NA0.007
LP-CF0.470.290.33–0.610.007NA
20/200–20/4000.650.210.58–0.720.6 × 10−12 0.03
  • NLP = no light perception in each eye; LP-CF = light perception to counting fingers in the better eye; 20/200–20/400 = 20/200 to 20/400 in the better eye;

  • using the heteroscedastic Student'st test compared with the NLP group;

  • using the heteroscedastic Student's t test compared with the light perception to counting fingers group; NA = not applicable.