The present study was conducted at the sugarcane mill Ingenio San Antonio (ISA) in Chinandega, Nicaragua.
Data collection occurred during the 2018-19 and 2019-20 sugarcane harvests (November–April). Ten manual jobs performed by workers at ISA (selected based on apparent differences in work effort) were identified for comparison.
For the current study, participants were recruited from among workers already participating in a larger crossharvest study (for further information see Hansson et al., 2019). As part of this larger study, pre-harvest data were collected that included a brief questionnaire plus an aliquot of morning blood and urine samples. End-harvest data included pre-work-shift blood and urine samples plus an extended questionnaire.

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