. Author manuscript; available in PMC: 2021 Mar 1.

Published in final edited form as: Am J Ind Med. 2019 Nov 26;63(3):258–268. doi: 10.1002/ajim.23076

Table III.

Odds of Acute Kidney Injury^a based on Logistic Regression (n=471)

	Model 1				Model 2				Model 3				Model 4				Model 5
	OR	95% CI	p-value		AOR	95% CI	p-value		AOR	95% CI	p-value		AOR	95% CI	p-value		AOR	95% CI	p-value
3-Minute Maximum Workload^b	2.28	1.36 - 3.85	<0.01	^*	2.23	1.31 - 3.79	<0.01	^*	2.21	1.28 - 3.82	0.01	^*	2.17	1.23 - 3.81	0.01	^*	1.92	1.05 - 3.51	0.03	^*
Age in years					1.00	0.98 - 1.02	0.77		1.00	0.97 - 1.02	0.70		0.99	0.96 - 1.02	0.56		1.05	1.01 - 1.09	0.04	^*
Sex
Male (reference)
Female					0.89	0.51 - 1.53	0.67		0.94	0.53 - 1.66	0.83		1.11	0.61 - 2.05	0.73		0.61	0.29 - 1.30	0.20
Volume Depletion^c
Lost <1.5% body mass (reference)
Lost ≥1.5% body mass									0.65	0.27 - 1.57	0.34		0.52	0.21 - 1.29	0.16		0.55	0.21 - 1.40	0.21
Change in Core Body Temperature									1.76	0.83 - 3.74	0.14		1.8	0.81 - 4.04	0.15		2.00	0.85 - 4.72	0.11
Max daily WBGT									1.01	0.93 - 1.10	0.80		1.06	0.97 - 1.15	0.81		1.09	1.00 - 1.20	0.05
Piece Rate Work^d													2.75	1.39 - 5.47	<0.01	^*	3.02	1.44 - 6.34	<0.01	^*
Years in Agricultural Work													1.02	0.99 - 1.05	0.23		1.02	0.99 - 1.06	0.23
Farm Task
Picking													1.40	0.75 - 2.61	0.30		1.57	0.81 - 3.04	0.18
Other (reference)
Week													1.02	0.95 - 1.09	0.66		1.04	0.97 - 1.12	0.30
Year													2.17	1.21 - 3.91	0.01	^*	1.18	0.61 - 2.30	0.62
BMI^e
Normal Weight (BMI<25) (reference)
Overweight (BMI 25-30)																	0.69	0.32 - 1.51	0.35
Obese (BMI >30)																	1.20	0.54 - 2.68	0.65
Diabetes^f
A1c <5.7% (reference)
A1c ≥5.7%																	0.66	0.31 - 1.42	0.29
Blood Pressure^g
Normal blood pressure (<120/80) (reference)
Elevated blood pressure (≤120/80)																	1.05	0.51 - 2.18	0.90
History of Kidney Disease
None (reference)
Personal or Family History																	1.20	0.63 - 2.29	0.58
Baseline eGFR																	1.07	1.04 - 1.10	<0.01	^*
AIC	390.47				394.20				394.53				378.42				355.07

Acute kidney injury based on KDIGO classification of elevations in serum creatinine

Workload as continuous data from Actical counts per minute

Percent body mass lost based on comparing pre-shift weight in kilograms and post-shift weight in kilograms

Payment by the piece compared to by the hour or salaried

BMI=Body Mass Index (kg/m2) categorized based on WHO recommendations

HgbA1c=Hemoglobin A1c, from capillary blood sample

Blood pressure based on JNC7 categories

significant at α<0.05