Counting of co-exposure

In this qualitative approach, the number of combinations of substances to which an individual is exposed are recorded, see Table 159. There is no cut-off level, the only criterion is the presence of a substance in the simulated daily diet (eventually aggregated withe exposure from non-dietary sources) or not. For an acute or short term exposure assessment, a simulated individual day is the smallest entity to determine co-exposure. For a chronic or long term exposure assessment, co-exposures are summarized at the individual level, e.g. co-exposure is determined combining all consumption days of an individual.

Table 159 Counting combinations of substances in the exposure matrix: for example, on day 1 there is coexposure to substances Tebuconazole, Bitertanol and Triadimefon

Substance	day 1	day 2	day 3	…	day n
Tebuconazole	x	x		…
Bitertanol	x		x	…	x
Triadimefon	x		…	…	x
…	…	…	…	…	…

In Table 160, the frequency and percentage for the number of substances occurring together are shown.

Table 160 Co-exposure of substances

Number of substances	Frequency	Percentage
0	337	3.4
1	959	9.6
2	1207	12.1
3	1275	12.8
…	…	…

In Table 161, the mixtures containing the substance(s) including all other combinations with the specified combination of substance(s), (a maximum number of 15 records is shown).

Table 161 Mixtures containing substances

Number of substances	Percentage	Substances
1	5.88	Tebuconazole
2	3.88	Imazalil (aka enilconazole), Tebuconazole
0	3.37
3	2.20	Difenoconazole, Imazalil (aka enilconazole), Tebuconazole
1	1.78	Imazalil (aka enilconazole)
3	1.76	Imazalil (aka enilconazole), Tebuconazole, Triadimenol
…	…	…