Determinants of high sessile serrated lesion detection: Role of faecal occult blood test and colonoscopy quality indicators

Table 2 Special definitions and data transformations

Characteristic	Terms	Explanation
Variables	Indication	For the purpose of this study, each colonoscopy was assigned only a single indication using a hierarchical coding system, with the following priority order: (1) Clinical symptoms; (2) FOBT (+); (3) Surveillance (previous patient); (4) Surveillance (new patient); and (5) Screening
	Bowel preparation status	Boston Bowel Preparation Scores were collated into three broad groups: Inadequate (BBPS ≤ 5), adequate (BBPS 6 or 7), good (BBPS 8 or 9)
	Serrated polyposis syndrome status	This variable amalgates the distinction between those with SPS diagnosed in a previous colonscopy and those with SPS diagnosed from the present colonoscopy. It represents whether SPS classified as present or absent
Polypectomy quality indicators	Polypectomy rate	The proportion of colonoscopies during which at least one polypectomy was performed
	ADR	The proportion of colonoscopies during which at least one conventional adenomatous polyp, (tubular adenomas, tubulovillous adenomas, or villous adenomas) was detected. Excludes malignancies
	ASLDR	The proportion of colonoscopies during which at least one serrated lesion was detected
	SPDR	The proportion of colonoscopies during which at least one SSL/dSSL or TSA is detected. Excludes HPs
	PSDR SDR	The propotion of colonoscopies during which at least one of any serrated lesion (HP, SSL, dSSL, or TSA) is detected proximal to the border between the descending and sigmoid colon
	SSL-DR	The proportion of colonoscopies during which at least one SSL, dSSL is detected

FOBT (+): Faecal occult blood test positive; BBPS: Boston bowel preparation scale; SPS: Serrated polyposis syndrome; SSL: Sessile serrated lesion; dSSL: Dysplastic sessile serrated lesion; ADR: Adenoma detection rate; ASLDR: Any serrated lesion detection rate; SPDR: Serrated polyp detection rate; PSDR: Proximal serrated detection rate; TSA: Traditional serrated adenoma; SSL-DR: Sessile serrated lesion detection rate; SDR: Serrated detection rate; HP: Hyperplastic polyp.