Table 3 Clustering of neurological symptoms according to previous work with pesticides.
Number of symptoms reported* | Never worked with pesticides | Ever worked with sheep dip | Ever worked with insecticides, never with sheep dip | Ever worked with other pesticides, never with sheep dip or insecticides | All subjects | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
O† | E‡ | O/E§ | O† | E‡ | O/E§ | O† | E‡ | O/E§ | O† | E‡ | O/E§ | O† | E‡ | O/E§ | |
0 | 4671 | 4044.2 | 1.2 | 1327 | 1071.6 | 1.2 | 601 | 493.1 | 1.2 | 712 | 587.8 | 1.2 | 7311 | 6185.8 | 1.2 |
1 | 893 | 1752.7 | 0.5 | 347 | 666.5 | 0.5 | 135 | 273.8 | 0.5 | 165 | 324.9 | 0.5 | 1540 | 3036.6 | 0.5 |
2 | 302 | 287.1 | 1.1 | 128 | 155.4 | 0.8 | 45 | 58.5 | 0.8 | 55 | 69.3 | 0.8 | 530 | 565.4 | 0.9 |
3 | 132 | 23.8 | 5.5 | 53 | 18.2 | 2.9 | 31 | 6.3 | 4.9 | 35 | 7.6 | 4.6 | 251 | 53.3 | 4.7 |
4 | 67 | 1.1 | 98.2 | 27 | 1.2 | 47.5 | 9 | 0.4 | 52.6 | 12 | 0.5 | 47.9 | 115 | 2.8 | 73.6 |
5 | 28 | 0.0 | 21 | 0.0 | 9 | 0.0 | 8 | 0.0 | 66 | 0.1 | |||||
6 | 10 | 0.0 | 8 | 0.0 | 2 | 0.0 | 1 | 0.0 | 21 | 0.0 | |||||
7 | 6 | 0.0 | 2 | 0.0 | 0 | 0.0 | 2 | 0.0 | 10 | 0.0 |
*From the seven symptoms listed in table 1.
†Observed number of subjects.
‡Expected number of subjects if prevalence of each symptom were statistically independent (see text).
§Based on expected numbers rounded to two decimal places.