Table 6.

GLS linear regression: RDT use observation scores

	Unadjusted	Model 2 (adjusted)a
	Percentage point change (95% CI)	Percentage point change (95% CI)
Covariates
Malaria blood slide preparation observation score	0.5 [0.4, 0.6]***	0.5 [0.4, 0.6]***
Malaria blood slide staining/reading score	0.4 [0.3, 0.5]***
All SOPs for malaria microscopy are present
Yes	Reference
No	− 2.9 [− 8.9, 3.2]
All bench aids for malaria microscopy are present
Yes	Reference
No	3.5 [− 2.1, 9.0]
Conducts malaria species identification
Yes	1.6 [− 3.2, 6.3]
No	Reference
Uses parasites/µL for parasite quantitation
Yes	3.4 [− 0.7, 7.5]
No	Reference
Uses “plus system” for parasite quantitation
Yes	− 6.7 [− 10.6, − 2.8]**	0.1 [− 4.1, 4.2]
No	Reference	Reference
Uses microscopy positive controls
Yes	2.2 [− 1.7, 6.0]
No	Reference
Stores stained microscopy slides for cross-checking
Yes	− 1.2 [− 5.0, 2.6]
No	Reference
Stock-outs of malaria microscopy consumables
Yes	− 3.2 [− 6.7, 0.2]†	1.1 [− 2.8, 5.1]
No	Reference	Reference
Stock-outs of RDTs
Yes	0.5 [− 4.9, 5.9]
No	Reference
Periodicity of OTSS assessments
All assessments occurred within a 1 year period	9.4 [2.9, 16.0]**	4.9 [− 0.9, 10.7]
All assessments occurred in > 1 year period	Reference	Reference
Number of OTSS visits
1	Reference	Reference
2	4.8 [0.4, 9.1]*	1.1 [− 4.7, 6.9]
3	4.3 [0.4, 9.0]*	1.3 [− 4.5, 7.1]
4	9.5 [5.1, 13.7]***	4.9 [− 1.1, 10.9]

Statistically significant results are in italics

CI confidence interval

Model 3: Wald X² = 90.7 (p < 0.0001); 191 observations

*** p < 0.001; ** p < 0.01; * p < 0.05; ^† p < 0.1

^aAn ex-ante pairwise correlation test was run to detect multicollinearity; covariates indicating problematic correlation (≥ 0.55) were not included in the fully adjusted model