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Br J Ophthalmol 83:707-712 doi:10.1136/bjo.83.6.707
  • Original Article
    • Clinical science

The Bristol Shared Care Glaucoma Study: reliability of community optometric and hospital eye service test measures

Table 5

Intra (within) centre validity for C/D ratio (direct clinical and photographic measurements)

Groups compared No Mean difference 95% CI for
mean difference 		SD 95%
TL 		TL as %
of range 		Crude ICC Adjusted ICC
C/D ratio:
RCRSv Obs 1 R 381 −0.15 −0.14, −0.16 0.14 0.27 33 −0.04 0.39
RCRSv Obs 1 L 384 −0.15 −0.14, −0.16 0.15 0.28 40 0.10 0.44
RCRSv Obs 2 R 381 −0.15 −0.13, −0.17 0.15 0.30 40 0.12 0.38
RCRSv Obs 2 L 384 −0.10 −0.08, −0.12 0.16 0.31 32 0.21 0.42
Obs 1v Obs 2 R 381 0.05 0.04, 0.06 0.12 0.23 38 0.34 0.38
Obs 1v Obs 2 L 384 0.05 0.03, 0.07 0.15 0.30 32 0.24 0.25

  • RCRS = research clinic reference standard observation; Obs 1 = stereo photograph assessment by first observer; Obs 2 = Stereo photograph assessment by second observer; R = right eye; L = left eye; SD = standard deviation of paired differences; CI = confidence interval (for the mean); TL = tolerance limit for change; ICC = intraclass correlation coefficient.

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