Table 3. Prevalence of low- and high-grade neoplasia of the larynx during the observation period, n (%) (N = 221).

	Gender	≤SIN 1	SIN 2+Δ	Total N (%)
Juvenile-onset RRP	Male	28 (90.3)	3 (9.7)	31 (100)
	Female	16 (88.9)	2 (11.1)	18 (100)
Adult-onset RRP*	Male	107 (77.0)	32 (23.0)	139 (100)
	Female	31 (93.9)	2 (6.1)	33 (100)

*The difference in development of SIN2+ was significant between genders in adults (p = 0.028).

^ΔHigh grade laryngeal neoplasia, including invasive SCC.