Table 3.

Congruence of strain typing results as indicated by adjusted Rand coefficients^a

First method	Congruence between first method and:
	PFGE	SCRA	DL
PFGE
SCRA	0.241 (0.099–0.389)
DL	0.562 (0.396–0.739)	0.377 (0.221–0.542)
AB	0.154 (0.058–0.253)	0.166 (0.040–0.295)	0.251 (0.121–0.379)

^aValues are adjusted Rand and jackknife pseudovalues (95% confidence intervals). Data were generated using the Comparing Partitions website (http://darwin.phyloviz.net/ComparingPartitions/index.php?link=Tool). Although PFGE and DL agreed 93% in their assessment of the patient pairs, the congruence value of 0.563, while highest among our testing methods, is not high. This is because PFGE is more discriminatory, as shown in Fig. 2 and in the contingency table (Table 4). The congruence of AB typing is the lowest with all methods.