Table 4. Association of scaling up a CI with the number of close, casual and community contacts evaluated and detected with LTBI found in the 14 CIs.

			Close contacts			Casual contacts			Community contacts
Case	PHN/PHS	Ethnicity indexcase	Number of contacts tested	Number of contacts with LTBI	Scaled up?	Number of contacts tested	Number of contacts with LTBI	Scaled up?	Number of contacts tested	Number ofcontacts with LTBI	Scaled up?
1	1/2	Native	3	1	Yesf	1†	0	Yesi	1	0	No
2	2/2	Immigrant	1	0	Yesb	38†	0	Yesi	3†	0	No
3	3/2	Immigrant	32	0	Yesd	8†	0	No	–	–	–
4	4/2	Immigrant	22	4	Yese	11†	0	No	–	–	–
5	1/3	Immigrant	6	0	Yesd	4	0	Yesi	1†	0	No
6	2/3	Native	23	6	Yesa	63	2	Yesh	1660	23	Yes
7	1/4	Immigrant	23	2	Yesa	1	0	No	–	–	–
8	1/5	Immigrant	5	1 (+1 TB)	Yesb	28†	0	No	–	–	–
9	2/5	Immigrant	25	5	Yese	5†	0	No	–	–	–
10	1/6	Immigrant	5	1 (+2 TB)	Yesa	129	8 (+1 TB)	Nok	–	–	–
11	2/6	Immigrant	17	0	Noc	–	–	–	–	–	–
12	3/6	Immigrant	21	5 (+2 TB)	Yese	114†	8	Noj	–	–	–
13	1/7	Immigrant	26	5	Yesa	4	1	Yesh	0	–	No
14	1/8	Native	1	0	Yesg	7†	0	Yesi	23	0	No

^†Tested concurrently with the previous group of contacts.

^aScaled up according to guidelines because the decision was based on the prevalence of infection among the close contacts.

^bScaled up according to guidelines because the PHN considered the number of close contacts too small to accurately assess the prevalence of infection.

^cCorrectly not scaled up because decision was based on prevalence of infection among the close contacts.

^dIncorrectly scaled up to casual contacts since no infection was found among the close contacts.

^eIncorrectly scaled up since casual contacts were tested concurrently with close contacts.

^fIncorrectly scaled up since casual contact was considered a ‘test case’.

^gIncorrectly scaled up since casual contacts were anxious.

^hScaled up to community contacts according to guidelines because the decision was based on the prevalence of infection among the casual contacts.

ⁱIncorrectly scaled up to community contacts since no infection was found among the casual contacts.

^jIncorrectly not scaled up to community contacts although prevalence of infection among casual contacts was high.

^kNot scaled up to community contacts because according to PHN there was no well defined group of community contacts.