Impact of sSFR, X-ray sources and outflows on the escape fraction. Left: impact of the measured sSFR from Rémy-Ruyer et al. (2015) on the f_esc, HII -metallicity relation. No sSFR measurement are available for galaxies 37: HS 0017+1055 and 38: HS 2352+2733. Middle: impact of the X-ray-to-stellar luminosity ratio. The green annuli mark galaxies in which a potential ULX (L_X > 10³⁹ erg s⁻¹) have been reported. 1: Haro 2 (Otí-Floranes et al. 2012), 3: Haro 11 (Prestwich et al. 2015; Gross et al. 2021), 4: He 2–10 (Ott et al. 2005; Reines et al. 2011), 13: I Zw 18(Thuan et al. 2004; Ott et al. 2005; Kaaret et al. 2011; Kaaret & Feng 2013; Brorby et al. 2014) and 25:SBS 0335-052 (Thuan et al. 2004; Prestwich et al. 2013). Right: impact of outflowing gas signatures. 1: Haro 2 Otí-Floranes et al. (2012), 3: Haro 11 (Menacho et al. 2019), 20: NGC 1569 (Sánchez-Cruces et al. 2015), 21: NGC 1705 (Zastrow et al. 2013), 22: NGC 5253 Zastrow et al. (2011), 23: NGC 625 (Cannon et al. 2004; McQuinn et al. 2018), 33: UM 461 (Carvalho & Plana 2018), 39-40: NGC 4214 (McQuinn et al. 2018).