“…An article often used a definition that allowed them to be placed in more than 1 category. When definitions related to population characteristics were used, it was more common for authors to consider population size (57.1%, n = 28) [ 8 , 19 , 44 , 46 , 48 , 50 , 61 , 63 , 64 , 68 , 70 , 74 , 76 , 82 , 83 , 86 , 94 , 100 , 102 , 103 , 105 , 106 , 108 , 109 , 116 , 119 , 122 , 128 ] than population density (28.6%, n = 14) [ 6 , 8 , 19 , 48 , 73 , 76 , 83 , 100 , 101 , 103 , 108 , 109 , 115 , 134 ] or housing density (14.3%, n = 7) [ 19 , 44 , 61 , 63 , 99 , 126 , 131 ]. When authors used environmental and land use definitions of rural, they tended to use various descriptors.…”