Evaluation of a laboratory quality assurance pilot programme for malaria diagnostics in low-transmission areas of Kenya, 2013

Table 3 Malaria microscopy diagnostic performance in malaria low-transmission areas in Kenya, June–December 2013

	Health-facility laboratory personnel						Quality assurance officers
	Visit 2		Visit 3		Visit 4		Visit 2		Visit 3		Visit 4
Total slides collected	709		408		509		709		408		509
Slides read by reference laboratory	675	95%	333	82%	509	100%	675	95%	333	82%	509	100%
Reference laboratory	Positive	Negative	Positive	Negative	Positive	Negative	Positive	Negative	Positive	Negative	Positive	Negative
Positive	48	2	8	1	8	7	48	2	8	1	9	6
Negative	75	550	7	317	9	485	44	581	2	322	7	487
Column total	123	552	15	318	17	492	92	583	10	323	16	493

	Health-facility laboratory personnel						Quality assurance officers
		95% CI		95% CI		95% CI		95% CI		95% CI		95% CI
Sensitivity	96%	86–100%	89%	52–100%	53%	27–79%	96%	86–100%	89%	52–100%	60%	32–84%
Specificity	88%	85–90%	98%	96–99%	98%	97–99%	93%	91–95%	99%	98–100%	99%	97–99%
PPV	39%	30–48%	53%	27–79%	47%	23–72%	52%	42–63%	80%	44–97%	56%	30–80%
NPV	99%	99–100%	99%	98–100%	98%	97–99%	99%	99–100%	99%	98–100%	99%	97–100%
Kappa value	0.50	0.41–0.59	0.66	0.43–0.88	0.48	0.27–0.70	0.64	0.55–0.74	0.84	0.66–1.00	0.57	0.36–0.78

Italic denotes statistically significant improvement from visit 2 to visit 4
CI confidence interval, PPV positive predictive value, NPV negative predictive value

ISSN: 1475-2875