Temporal variation of residential pesticide use and comparison of two survey platforms: a longitudinal study among households with young children in Northern California

Table 5 Temporal variation of pesticide use frequency and Kendall’s intraclass correlation coefficients (ICCs)

Type of pesticide application	Telephone survey		Web survey
Type of pesticide application	Effect	ICC	Effect	ICC
Outdoor sprays	No variation observed	0.16	Decreasing across quarters	0.30
Outdoor sprays	No variation observed	0.16	warm season > cool season	0.30
Indoor sprays	No variation observed	0.05	No variation observed	0.20
Behind-the-neck treatment on pet	No variation observed	0.45	Decreasing across quarters	0.66
Professional application in the yard	—	—	No variation observed	0.77

Note: Results from mixed-effects linear regression models of rank-transformed longitudinal usage frequencies. In annually telephone surveys, pesticide use frequencies were tested for variation across years, and analyses were conducted among users who completed more than one surveys. In quarterly web surveys, pesticide use frequencies were tested for seasonal variation and variation across quarters, and analyses were conducted among users who completed more than one surveys.

ISSN: 1476-069X