Table 3.
Comparison of reliability of self-reported pesticide usea by case-control status (cases, n=209 and controls, n=235), NCCLS, 2001–2006
| Kappa (95% CI)
|
Percent positive (%)(95% CI)
|
Percent negative (%)(95% CI)
|
||||
|---|---|---|---|---|---|---|
| Cases | Controls | Cases | Controls | Cases | Controls | |
| Fleas, ticks | 0.53 (0.41–0.65) | 0.58 (0.47–0.68) | 70 (61–78) | 74 (66–81) | 83 (78–88) | 84 (79–88) |
| Ants, flies, cockroaches | 0.35 (0.22–0.49) | 0.31 (0.18–0.43) | 80 (75–85) | 77 (71–82) | 55 (45–66) | 54 (44–63) |
| Indoor foggers | 0.42 (0.21–0.63) | 0.40 (0.21–0.58) | 47 (28–67) | 46 (28–63) | 95 (92–97) | 94 (91–96) |
| Weeds, insects, plants | 0.52 (0.40–0.64) | 0.47 (0.35–0.58) | 70 (62–78) | 72 (66–79) | 81 (76–86) | 74 (68–81) |
| Professional pest service | 0.56 (0.44–0.68) | 0.58 (0.47–0.69) | 70 (61–79) | 72 (64–80) | 86 (81–90) | 86 (82–90) |
| Professional lawn service | 0.61 (0.48–0.74) | 0.51 (0.36–0.66) | 71 (61–81) | 58 (45–72) | 90 (87–94) | 92 (90–95) |
| Overall | 0.58 (0.52–0.62) | 0.56 (0.51–0.61) | 72 (69–76) | 72 (68–75) | 85 (83–87) | 85 (83–86) |
| Mean difference (95% CI) b | − 0.02 (−0.06, 0.01) | − 1.5 (−4.2, 1.2) | −1.0 (−2.0, 0.1) | |||
| p-value c | 0.840 | 0.927 | 0.812 | |||
a
Pesticide use: from three months prior to conception until three years of age
b
Bootstrap estimates for difference of means and variances between cases and controls
c
Bootstrap estimated p-value