condition mean min max ZT0-3 22.120266666666666 18.876600000000003 25.252899999999997 ZT4-7 19.8688 19.8688 19.8688 ZT8-11 18.8579 18.8579 18.8579 ZT12-15 25.603175 24.81175 26.394599999999997 ZT16-19 20.11865 20.11865 20.11865 ZT20-23 19.8474 19.8474 19.8474