The $10 Minimum Wage in San Jose: the Impact on the Restaurant Industry [pdf]

Some interesting numbers that represent roughly 1 in 8 of San Jose’s restaurants:

Increased Prices: 66.3%

Reduced Employee Hours: 44.8%

Reduced Staffing Levels: 42.3%

Closed Locations in San Jose: 7.4%

Limited Future Expansion Plans: 30.1%

EDIT: formatting

that's a very awful and badly executed survey.

So, is this change clearly attributable to that legislation, or could've be something else?

Since they simply asked restaurant owners, there is a "soft" attribution to the legislation: "in the owner opinion..."