condition mean min max ZT0-3 17.5564 17.5564 17.5564 ZT4-7 16.9149 16.9149 16.9149 ZT8-11 10.486699999999999 10.486699999999999 10.486699999999999 ZT12-15 20.669249999999998 20.669249999999998 20.669249999999998 ZT16-19 18.9008 18.9008 18.9008 ZT20-23 23.241149999999998 23.241149999999998 23.241149999999998