No one poll is a perfect snapshot of reality -- which is why it makes sense to look at multiple surveys, averages and aggregations.
A comparable hepatitis C estimate from England and Wales (using multiple surveys, register data and mathematical modelling) found that former injectors constituted 47%, current injectors 38% and never-injectors 15% of the total British hepatitis C estimate (0.60% of the adult population) [ 26, 27].
Our study has used data sourced from multiple surveys (contextual, household, and individual) in 497 districts.
Respondents were queried about their individual preferences on the five stated health system goals in a total of 51 countries, in some of which multiple surveys were performed, and country means were calculated on the basis of these individual responses [ 18].
Data for the last decade also included personal records and associated sample collections made by our team in multiple surveys of the Iberian and Moroccan coastline for genetic sampling of this species for previous studies [ 63, 72, 82, 83] and of species that co-occur in the same habitats [ 17, 84, 85].
Before we officially announced a move, we sent out multiple surveys to all employees and asked if they would be willing to move to a number of locations outside of San Francisco — including San Diego.
An important strength of the study is that it is based on a unique dataset, comprising multiple cohorts of medical graduates, and multiple surveys of each cohort, over 35 years.
Since the National Hospital Insurance Fund (NHIF), the major insurer in Kenya, does not have the capacity to undertake multiple surveys of smaller facilities and clinics, they are now working with KMET to ensure integration of their different approaches.
Individual random effects were included to account for repeated measures of the same individuals in multiple survey rounds and household random effects were included to account for residual correlation between children residing in the same household.
