condition mean min max ZT0-3 1.5058699999999998 1.5058699999999998 1.5058699999999998 ZT4-7 1.680605 1.680605 1.680605 ZT8-11 1.113655 1.113655 1.113655 ZT12-15 1.587735 1.587735 1.587735 ZT16-19 4.081395 4.081395 4.081395 ZT20-23 2.26601 2.26601 2.26601