The DOT crosswalk inside of the O*NET lists 553 distinct DOT codes that form helpers - production workers. Of that 553 occupations, 12 unskilled sedentary; 157 unskilled light; 172 unskilled medium; 105 unskilled heavy; and 6 unskilled very heavy. The other 101 require skills. The OOH describes the group:
We really need to know how many of these occupations require light and sedentary exertion. For that, we turn to the OccuCollect compilation of the Occupational Requirements Survey.
Almost three quarters of the jobs require medium exertion even though a third of the DOT codes suggest medium exertion as the typical requirements. Let's run down the rabbit hole a bit further: ORUP1000030A00000663
% of helpers--production workers; strength is medium work
strength is medium work
2017 Annual 74.6