. Author manuscript; available in PMC: 2019 Sep 1.

Published in final edited form as: J Public Health Dent. 2018 May 12;78(4):321–328. doi: 10.1111/jphd.12275

Table 1.

Demographics of Iowa Fluoride Subjects

Variable	Category	Mean (SD)/N (%)
Age (years)	Age 9	9.22 (0.73) (n=376)
	Age 13	13.48 (0.62) (n=382)
	Age 17	17.74 (0.70) (n=372)
	Time Between Age 9 and 13 Visits	4.24 (0.83) (n=382)
	Time Between Age 13 and 17 Visits	4.26 (0.82) (n=372)
Sex	Male Female	183 (46.7%) 209 (53.3%)
Annual Income Category in 2007	< $60,000 $60,000 or more	123 (31.4%) 269 (68.6%)
Mother’s Education in 2007	< 4-Year College Degree 4-Year College Degree or more	195 (49.7%) 197 (50.3%)