condition mean min max ZT0-3 8.345245 8.345245 8.345245 ZT4-7 44.46145 44.46145 44.46145 ZT8-11 25.55225 25.55225 25.55225 ZT12-15 15.1492 15.1492 15.1492 ZT16-19 3.327355 3.327355 3.327355 ZT20-23 5.4482 5.4482 5.4482