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. Author manuscript; available in PMC: 2017 Sep 27.
Published in final edited form as: Br J Ophthalmol. 2016 May 6;101(3):342–347. doi: 10.1136/bjophthalmol-2016-308587

Table 2.

Number of observed and expected cases of large drusen adjusting for age distribution and by race

Number of large drusen cases
Race Observed Expected* SMR (95% CI)†
White 2 7.03 0.28 (0.09 to 0.79)
Black 2 4.31 0.46 (0.14 to 1.29)
All 4 12.49 0.32 (0.12 to 0.70)
*

Expected number of large drusen cases were estimated using indirect age adjustment, in which we applied the US age-specific rates for large drusen1 to our uveitis population in each age stratum.

†

SMR (standardised mortality ratio): An SMR of 1 indicates that the observed number of events is equal to the expected number of events if the US population rates held in the uveitis population. An SMR <1 indicates that the observed number of events is fewer than expected, while SMR >1 indicates that the observed number of events is more than expected. 95% CIs for SMR values are calculated based on the Poisson distribution.