Measure of Variability (MOV) graph

Population Receiving Fluoridated Water, Percentage Population Served by Community Water Systems, 2019
4/28/2024 8:16:12 AM

Data Note(s)

Data Source: Florida Department of Health, Public Health Dental Program (PHDP)

  • Chart will display if there are at least three years of data.

  • Multi-year counts are a sum of the selected years, not an average.

  • Quartiles are calculated when data is available for at least 51 counties.

  • MOV - Measure of Variability: Probable range of values resulting from random fluctuations in the number of events. Not calculated when numerator is below 5 or denominator is below 20, or count or rate is suppressed. The MOV is useful for comparing rates to a goal or standard. For example, if the absolute difference between the county rate and the statewide rate is less than the MOV, the county rate is not significantly different from the statewide rate (alpha level = 0.05). When the absolute difference between the county rate and the statewide rate is greater than the MOV, the county rate is significantly different from the statewide rate. MOV should not be used to determine if the rates of two different counties, or the county rates for two different years, are statistically significantly different.

  • Denom - abbreviated for Denominator.

  • Population estimates are not available for persons whose county of residence is unknown. Given this, the denominator and associated rate are not available.

  • * - Indicates the county rate is statistically significantly different from the statewide rate.

  • A community water system serves at least 15 service connections used by year-round residents or regularly serves at least 25 year-round residents.
  • All of the population served counts are determined by the Florida Department of Environmental Protection and provided to the PHDP on an annual basis at the water system level.
  • In order for a community water system to be considered as fluoridated water, it must fall into one of the following categories for at least one month of the calendar year: 1. Adjusted (supplements water with fluoride) 2. Naturally fluoridated (fluoride levels naturally occurring in water) 3. Consecutive (buys water from an adjusted, natural fluoridated or fluoridated consecutive water system)
  • Numerator: Number of people on community water systems receiving fluoridated water. Denominator: Number of people on community water systems.
  • The methodology of this measurement may have changed over time, specifically from 2013 forward.
  • This is secondary, quantitative data.