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

Table 4 Consistency of prevalence reported in telephone interviews and web surveys

Reponses in Year-2 phone interviews^a	Reponses in web surveys		Kappa coefficient
Reponses in Year-2 phone interviews^a	User	Non-user	Kappa coefficient
Outdoor spray (N = 140)			0.50
User	30%	6%	[0.36,0.64]
Non-user	19%	45%
Indoor spray (N = 141)			0.36
User	15%	13%	[0.19,0.53]
Non-user	13%	60%
Indoor fogger (N = 141)			0.74
User	4%	1%	[0.49,0.98]
Non-user	1%	93%
Behind-the-neck treatment on pets (N = 76) ^b			0.86
User	55%	5%	[0.75,0.98]
Non-user	1%	38%
Professional application (N = 97) ^c			0.87
User	24%	4%	[0.75,0.98]
Non-user	1%	71%

^aOnly the data from Year-2 telephone surveys (conducted between April 2008 and February 2010) were used for comparison, as this resulted in the most overlap in time between both surveys (web surveys were conducted between October 2007 and September 2009). ^bAmong pet owners only. ^cQuestions on professional applications were added in the middle of the study.

ISSN: 1476-069X