Existing measurements of the size-number distribution of small bodies in the outer Solar system. We compare the results of occultation surveys (upper limits: Bickerton et al. 2008; Bianco et al. 2009; Wang et al. 2010; Chang et al. 2013; Zhang et al. 2013; and detections: Schlichting et al. 2012; Liu et al. 2015; Arimatsu et al. 2019; Doressoundiram et al. 2020), optical surveys (Fraser et al. 2014), and crater counting (Singer et al. 2019), which are converted into a population number using the dynamical model of Greenstreet et al. (2015). Because the different types of surveys use different measurements, they can only be directly compared in a somewhat model-dependent way. Thus, the apparent disagreement may represent a disagreement of the observations, or an incorrect assumption in the modelling.