Table 3.

Malignancy rates of the adjusted Bethesda categories by cytological-histological correlation

Hospital	Study cohort	Operated nodules	Risk of malignancy in the Bethesda category (%)
			I	II	III	IV	V	VI
Srinagarind Hospital, Khon Kaen [21]	1984–1990	101	n/a	11.4	n/a	12.5	n/a	100
Ramathibodi Hospital, Bangkok [22]	1988–1990	77	n/a	8.6	31.3	n/a	n/a	75
Chiang Mai University [23]	1996–1999	230	n/a	2.5	n/a	22.6	n/a	90.2
Chiang Mai University [24]	1992–2000	174	n/a	5.1	n/a	30.6	50	88.2
Chonburi Hospital [25]	1999–2003	97	17.4	9.1	n/a	15.4	33.3	100
Songklanagarind Hospital, Hat Yai [26]	1999–2003	341	n/a	8.5	n/a	23.2	68	73.9
Ratchaburi Hospital [27]	2001–2005	101	n/a	11.4	n/a	n/a	71.4	100
Buddhachinaraj Phitsanulok Hospital [28]	2005–2009	234	14.3	6.8	57.1	6.1	92.9	100
Ramathibodi Hospital, Bangkok [29]	2005–2008	469	28.4	9.5	n/a	42.4	86.7	100
Siriraj Hospital, Bangkok [30]	2002–2004	60	n/a	5.6	n/a	37.5	n/a	100

Modified from Limlunjakorn et al. J Med Assoc Thai 2017;100:783-92, with permission of Medical Association of Thailand. [20]

n/a, not available.