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Table 3 Observed variables and change in Hb level in the organophosphate spray session (OP) and in the placebo spray session (PL)

From: The use of self-reported symptoms as a proxy for acute organophosphate poisoning after exposure to chlorpyrifos 50% plus cypermethrin 5% among Nepali farmers: a randomized, double-blind, placebo-controlled, crossover study

Variable OP (n = 42) PL (n = 42)
Temperature (°C), mean (SD) 29.1 (3.3) 28.9 (3.5)
Area of land sprayed (Katha), median (IQR) 5.0 (4.0–6.6) 5.0 (3.9–6.0)
Leaking sprayer, n (%) 9 (21.4) 12 (28.6)
Clothing worn during spraying, n (%)
 Long-sleeved shirt 18 (42.9) 17 (40.5)
 Long pants 20 (47.6) 20 (47.6)
 Hat 21 (50.0) 23 (54.8)
 Cloth mask 8 (19.0) 12 (28.6)
Work practices during and after spraying, n (%)
 Splash/spill on e.g. hands/feet 25 (59.5) 24 (57.1)
 Spray against the wind 27 (64.3) 25 (59.5)
 Walk in just sprayed crop 42 (100) 41 (97.6)
 Keep nozzle close to the body 40 (95.2) 40 (95.2)
 Nozzle direction in front of farmer 42 (100) 42 (100)
 Adjust/repair equipment with bare hands 17 (40.5) 17 (40.5)
 Eat/drink/smoke without prior hand wash 13 (31.0) 10 (23.8)
 Suck/blow nozzle with mouth 5 (11.9) 2 (4.8)
 Do not wash hands immediately after spraying 4 (9.5) 5 (11.9)
 Do not bath/change clothes soon after spraying 14 (33.3) 14 (33.3)
Change in Hb level (g/dL) from baseline to follow up, mean (SD) −0.13 (0.54) 0.06 (0.65)