Here is a thread which mentions Zvi Bodie's "Worry Free Investing" where he advocates 0% stocks and 100% TIPS for investing for retirement: Bogleheads :: View topic - Advice for meager IRA
The thread has a link to a series of 10 videos by him which are worth watching. I do not see any reason for one to own any stocks at all if one does not want to. But, if one has only TIPS, then one would need to save a lot more money or work a lot longer before retiring with a confident amount of assets.
I think my equities have paid about 5% to 7% over the past 10 years. It is a difficult calculation since I have bought and sold (especially tax-loss harvesting) along the way.