Table 1. Characteristics of SPS cases in the study.

		N (%)
Sex	female	39 (60%)
	male	26 (40%)
Age at Diagnosis (yrs)	mean	51.5
	SD	15.3
	min	18
	max	79
Polyp count (min)*	mean	31.7
	SD	23.5
	min	5
	max	130
WHO criteria≠	1	6 (9.2%)
	3	54 (83.1%)
	Inconclusive∧	5 (7.7%)
Developed CRC	No	44 (67.7%)
	Yes	21 (32.3%)
First-degree relative with CRC	No	37 (56.9%)
	Yes	28 (43.1%)

^*minimum number of polyps observed, polyp count may be a cumulative count.

^≠The frequency of individuals with SPS that meet WHO criteria 1 or 3, where individuals that met WHO criteria 2 only weren’t included.

^∧WHO criteria could not be determined as polyp count listed as “multiple” but >5.