condition mean min max ZT0-3 162.057464 162.057464 162.057464 ZT4-7 119.51954699999999 119.51954699999999 119.51954699999999 ZT8-11 138.491346 138.491346 138.491346 ZT12-15 137.0289095 137.0289095 137.0289095 ZT16-19 267.32227 267.32227 267.32227 ZT20-23 250.96842200000003 250.96842200000003 250.96842200000003