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

Table 6 Consistency of use frequency reported in telephone interviews (converted to average use in a 3-month period) and web surveys (household average use in 3-month recall period) ^a

Reponses in Year-2 telephone interviews (average use frequency for a 3-month period)^b	Reponses in web surveys (household average # of uses in a 3-month period)			% of web surveys that agreed with telephone surveys	Kappa coefficient
	0-1	2-3	4 or more	% of web surveys that agreed with telephone surveys	Kappa coefficient
Outdoor spray (N = 77)					0.22
0-1	74%	9%	3%	86%	[-0.01,0.46]
2-3	8%	1%	0%	17%
4 or more	0%	3%	3%	50%
Indoor spray (N = 56)					0.06
0-1	70%	9%	4%	85%	[-0.15,0.28]
2-3	11%	2%	0%	17%
4 or more	2%	4%	0%	0%
Indoor fogger (N = 10)					—
0-1	90%	10%	0%	90%
Behind-the-neck treatment on pets (N = 45)					0.17
0-1	51%	20%	4%	68%	[-0.06,0.41]
2-3	9%	7%	7%	30%
4 or more	0%	0%	2%	100%

^aNote that only those who have reported use either in telephone interviews or in web surveys were included. Frequencies of professional applications were not compared, since the location categories do not match for telephone interviews and web surveys.
^bThis was obtained by dividing the annual use by 4.

ISSN: 1476-069X