A bar graph comparing institutions with and without accessibility policies on various measures of accessibility. Those measures on which there is a significant difference between the two groups (p<.001) include:

There is only a slight difference (p<.05) on use of LANG attribute (with policy = 42%, without policy = 37%), and no significant difference on HTML headings (with policy = 80%, without policy = 78%) or ARIA landmarks (with policy = 4%, without policy = 3%)