Table 4 Effect of washing methods on the reduction of faecal coliform and helminth eggs levels of lettuce irrigated with polluted water (n = 10 for each method)

Faecal coliform (log₁₀ MPN 100 g⁻¹)

4.23^x (0.71)^a

3.43 (0.77)^b

3.35 (0.61)^b

2.54 (0.51)^c

2.58 (0.43)^c

Helminth eggs (eggs 100 g⁻¹)

2.2^y (1.93)

0.8 (1.14)

0.6 (0.70)

1.0 (1.33)

0.6 (0.97)

Actual egg count (range)

0–6

0–3

0–2

0–4

0–3