Table 4.

Number and percentage of adjusted community water systems that maintained average fluoride concentration within selected control ranges around the target fluoride concentration for 60, ≥57, ≥54, ≥48 or ≥45 of 60 months during 2006–2010 among 990 adjusted systems with data for all 60 months

Number of adjusted community water systems that maintained average fluoride concentration within control range for:
Control range		60 months	≥57 months	≥54 months	≥48 months	≥45 months
State established		424	693	778	866	896
Hypothetical
Lower limit	Upper limit
Target − 0.1	Target + 0.5	313	553	664	793	833
Target − 0.3	Target + 0.3	520	757	843	909	926
Target − 0.2	Target + 0.2	334	597	701	817	843
Target − 0.15	Target + 0.15	156	383	486	652	704
Target − 0.1	Target + 0.1	88	225	317	499	581
Percentage of adjusted community water systems that maintained average fluoride concentration within control range for:
Control range		60 months	≥57 months	≥54 months	≥48 months	≥45 months
State established		43%	70%	79%	87%	91%
Hypothetical
Lower limit	Upper limit
Target − 0.1	Target + 0.5	32%	56%	67%	80%	84%
Target − 0.3	Target + 0.3	53%	76%	85%	92%	94%
Target − 0.2	Target + 0.2	34%	60%	71%	83%	85%
Target − 0.15	Target + 0.15	16%	39%	49%	66%	71%
Target − 0.1	Target + 0.1	9%	23%	32%	50%	59%