Independent variable, continuous	Mean	SE
% of ad valorem among excises	36.431	0.099
Taxes	2.978	0.578
Log form taxes	0.627	0.184
GDP per capita in 10 thousands	2.795	0.340
Log form GDP	9.834	0.164
% Unemployment	5.399	0.488
% Female	50.242	0.229
% Population 15+	78.130	1.317

Statistics were adjusted for correlations within country over years. Tax structure shares in this sample are as the following: 44% had a specific uniform structure, 3% had a specific tiered structure, 36% had a mixed uniform structure, 5% had a mixed tiered structure, 10% had an ad valorem tax structure and 3% had an ad valorem tiered structure.
GDP, gross domestic product; HIC, high-income country.