Table 1.

Generalized estimating equations for Ebola virus spread at household level in Village X, Sierra Leone, August to October 2014, n = 865 (27 cases and 838 non-cases)

Variables	OR	Wald test	s.e.	P-value	Correlation Esta	Correlation s.e.a
Multivariate non quarantine GEE
Time (outbreak day)	1·03	3·48	0·014	0·062	0·0027	0·0063
Average distance (10 m intervals)b	0·978	0·31	0·004	0·577
No. of residents	1·04	5·59	0·017	0·018
Multivariate prompt quarantine GEE
Time	1·03	3·47	0·014	0·062	0·0027	0·0063
Average prompt quarantine distancec	0·977	0·34	0·039	0·558
No. of residents	1·04	5·50	0·017	0·01

OR, household average odds ratio (population average for the odds of a household becoming a case-household).

^aThe Correlation Estimate and Correlation Standard Error show the estimation and s.e. of the within clustered values. The low values illustrate that the unit of clustering (the household) were not very different from each other.

^bDistance is average distance between the household in question and all Ebola case-households that had symptoms at least 2 days prior.

^cQuarantine Distance is average distance between the household X and all Ebola case-households that had symptoms at least 2 days prior and were not quarantined prior to the onset date of symptoms in household X.