The percentage of survey respondents responding to (A) the number of insecticide applications per year (n = 31), and (B) selection attributes for insecticide use in their facility (n = 27). ⁺Others include cost, effectiveness and applicator safety (n= 1), environmental safety (n= 1), and residual activity (n= 1). Bars with same letters are not significantly different (comparing v² of odds ratio, a = 0.05).