I did find these:
Back to the study. Just what did the Economic Policy Institute find?:
* Women's wages dropped 4.4 percent in states where unionized companies made union dues optional. (Men's wages were 1.7 percent lower).
* The hit to wages was higher among non-whites. Blacks and Hispanics were paid 4.8 percent and 4.4 percent less than their non-union peers.
* On average, annual wages and benefits are $1,500 lower in RTW states than for comparable workers in non-RTW states — for both union and nonunion workers.
* Right-to-work laws widened the pay gap between men and women.
Do Right-To-Work states hurt wages? | StarTribune.com
We find that the mean effect of working in a right-to-work state results in a 6% to 8% reduction in wages for workers in these states, with an average wage penalty of 6.5%. Controlling for regional costs of living reduces this amount to approximately 4%. We find that previous research reporting real wage gains associated with right-to-work states is almost purely the result of border cities that benefit from their proximity to a non-RTW state.
The Wage Penalty of Right-to-Work Laws | Economic Policy Institute
(A large Economic Policy Institute study from 2011 found that, after controlling for a host of factors, right-to-work states have lower wages on average than pro-union states.)
(snip)
Lonnie Stevans in 2007 found that right-to-work laws do help boost the number of businesses in a state — but the gains mostly went to owners, while average wages went down. ”
What do ‘right-to-work’ laws do to a state’s economy?