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The development of elevated IOP and cataracts was calculated using the incidence density.
The index date was considered to be the date of the first admission for cases.> -wrap-foot> ICD Internatiofal Classification of Diseases For each case, up to ten controls were randomly selected using the incidence density sampling method and matched on age (±5 years), sex, and follow-up time (±90 days).
Five never-admitted referents of the same gender and age were selected for each case, using the incidence density risk set matching method [ 37], in the Statistics Denmark's Integrated Database for Labour Market Research IDAA) 5% sample of the Danish population.
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We used the incidence density method to calculate the annual incidence of periprosthetic femoral fractures.
We used the incidence density method to calculate the annual incidence of these fractures and Cox proportional hazards models to identify risk factors for periprosthetic fracture.
As a last remark, we used the incidence density sampling for nested case control analyses specifically to measure the impact of time-window bias, which is specific to case control studies.
Within each cohort, controls were matched to cases by using the incidence-density method.
The controls were selected using the incidence-density sampling technique (Wacholder et al. 1992), that is, the controls had to be alive and at risk of fracture at the time the hip fracture in the patient corresponding to the controls was diagnosed.
We assessed the effect of LLINs on mosquito density using the Incidence of Density Ratio (IDR) of LLINs versus non-insecticidal (control).
The use of the incidence density permitted to include the results of interim examinations which would be lost if had been adopted the caries increment as an effect measure [ 26].
The cases of cleared GBV-C infection from Group 1 were used to calculate the incidence density of cleared GBV-C infection at visit 5, and the new cases of active GBV-C infection from Group 2 were used to calculate the incidence density of active GBV-C infection at visit 5, along with their exact Poisson 95% confidence intervals.
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