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Table 9 Estimates of intervention impact using alternative model specifications

From: Impact of reliable light and electricity on job satisfaction among maternity health workers in Uganda: A cluster randomized trial

  Model 1 Model 2 Model 3 Model 4
Satisfaction with light and electricity 8.68* 0.19 0.19 0.19
[1.30, 58.16] [− 0.03, 0.40] [− 0.03, 0.40] [− 0.00, 0.46]
Observations 139 139 139 139
Control mean 0.04 0.04 0.04 0.04
Satisfaction with light 87.20*** 0.75*** 0.76*** 0.76***
[19.75, 384.98] [0.62, 0.88] [0.63, 0.90] [0.60, 0.91]
Observations 139 139 139 139
Control mean 0.05 0.04 0.04 0.04
Satisfaction with electricity 6.88 0.18 0.19 0.19
[0.89, 53.01] [− 0.03, 0.39] [− 0.03, 0.40] [− 0.00, 0.46]
Observations 139 139 139 139
Control mean 0.05 0.04 0.04 0.04
Impact of lack of overhead light index 0.40*** − 1.96*** − 1.96*** − 1.96***
[0.34, − 0.46] [− 2.46, − 1.47] [− 2.56, − 1.37] [− 2.75, − 1.33]
Observations 136 136 136 136
Control mean 3.28 3.28 3.28 3.28
Job satisfaction index 1.06 0.24* 0.30** 0.30*
[0.95, 1.17] [0.04, 0.45] [0.11, 0.49] [0.09, 0.50]
Observations 139 139 139 139
Control mean 3.17 3.17 3.17 3.17
Regression model Logistic/Poisson Linear Linear Linear
Facility fixed/random effects None Random Fixed Fixed
Bootstrapped standard errors No No No Yes
  1. Linear models report coefficients. Logistic models report odds ratios for binary variables. Poisson models report incident rates for count variables. Standard errors are clustered at facility level. Bootstrapped standard errors are calculated using the wild cluster bootstrap method. Satisfied with light and electricity is equal to 1 if health worker strongly agrees or agrees with both (1) I am satisfied with the availability and brightness of light in this facility and (2) I am satisfied with the availability of electricity in this facility. Impact of lack of overhead light index is an index of 14 items measuring health workers’ assessment of impact of lack of overhead light on their ability to conduct job tasks, including how often health worker: conducted deliveries without overhead light; had to hold torch in hand/mouth to see patient; experienced lack of light that affected normal care provided; delayed care; feared to move around facility; was affected in ability to suture, find/use equipment, conduct examinations of mother, provide emergency care, provide newborn care, monitor fetal heartrate, administer medication, clean up after delivery, manage infection control. This is reversely coded so that higher score indicates more frequent negative impact. Job satisfaction index is the mean score of four statements on a 1–5 scale: (1) These days, I feel motivated to work as hard as I can. (2) Overall, I am satisfied with my job. (3) Overall, the morale level at my department is good (4) I plan on staying at this position for the next year
  2. *p < 0.05, **p < 0.01, ***p < 0.001