I need to code the hairy-footedness of a large number of rodents for a statistical analysis. In most cases it is simple enough to code hairy-footed species as 1 and naked footed ones as 0; however, the following five species are described as intermediate in hairy footedness in different references. Furthermore, they are intermediate in different ways and to different degrees (see the description below), so each has to be considered separately. If I had to do a binary coding for this character, what is the more reasonable value (0 or 1) to be assigned to each of the species?

Gerbillus nancillus: “Soles of hind feet partly naked behind, with short hairs at level of the metacarpal bones” (Mammals of Africa, Kingdon et al, 2013) — "It is a relatively small gerbil with partially furred soles (posterior portion naked)", "an almost naked hindfoot sole (it is only partially haired in G.nancillus" (Mammals of Sub-Saharan Africa, Monadjem et al, 2015) — "Intermediate" (Lay, 1983)

Gerbillus nigerae: “[S]oles of hindfoot covered with hairs of variable length” (Mammals of Africa, Kingdon et al, 2013) — "These last three-mentioned species [G. henleyi, G. nancillus, G. nanus] also have naked or semi-naked soles of the hindfeet, which are completely haired over along their length in G.nigeriae" (Mammals of Sub-Saharan Africa, Monadjem et al, 2015) — "Intermediate"(Lay, 1983)

Meriones shawi: "Soles of hindfeet partly hairy" (Mammals of Africa, Kingdon et al, 2013) — “The sole of the hind feet is half covered with very fine fur” (Darvish, 2011)

Meriones tristrami: “Soles Partially covered with hair” (Mammals of Jordan, Amr, 2012) —“The sole of the hind feet is mainly hairy; the heel is bare with an irregular black line of demarcation” (Darvish, 2011)

Gerbillurus vallinus*: "Hairy footed gerbils" "soles partially furred" (Mammals of Africa, Kingdon et al, 2013) — "the anterior soles of the hindfeet are furred" (The Complete Book of the Southern African Mammals, Mills and Hes, 1997) —“Soles of hind feet of G. vallinus are naked from heel to the middle of the sole” (Dempster et al, 1999)

*I know it is called the brush-tailed hairy-footed gerbil, but unlike the other congeners that I have looked at the back half of the foot is described as naked).