Table 1.

Patient characteristics

Variable	Value
Patients – no.	96
Age - years
Mean ± SD	59.9 ± 6.6
Range	43 – 77
Sex – no. (%)
Male	52 (54)
Female	44 (46)
Chinese Ethnicity – no. (%) *	96 (100)
Grade of esophageal neoplasia at study entry – no. (%)
MGIN	45 (47%)
HGIN	42 (44%)
T1m2 ESCC	9 (9%)
Length of unstained lesions – cm
Mean ± SD	6.5 ± 2.9
Range	2 – 13†
Length of treatment area – cm
Mean ± SD	8.6 ± 2.9
Range	4 – 15†
Initial RFA - no. (%)
Circumferential	93 (97%)
Focal	3 (3%)
Endo time (hr:min), median (IQR)	0:28 (0:16–0:42)
RFA time (hr:min) only, median (IQR)	0:15 (0:07–0:23)
Follow-up RFA
Patients receiving follow-up RFA - no.	64
Number of follow-up RFAs - no.	89
Circumferential - no. (%)	1 (1%)
Focal - no. (%)	87 (98%)
Circumferential and Focal - no. (%)	1 (1%)
Endo time (hr:min), median (IQR)	0:25 (0:21–0:31)
RFA time (hr:min) only, median (IQR)	0:10 (0:06–0:13)
Total RFA
Patients - no.	96
Mean ± SD	1.9 ± 0.8
Range (min – max)	1 – 4
Total RFA procedures in study	185

^*Ethnicity was self-reported

^†After enrollment, one patient was determined to have a total length of unstained lesions of 13 cm and total length of treatment area of 15 cm; this was noted as a protocol deviation

MGIN: moderate-grade intraepithelial neoplasia

HGIN: high-grade intraepithelial neoplasia

ESCC: esophageal squamous cell carcinoma

hr:min: hour:minute duration of endoscopy procedure or RFA portion of procedure