condition mean min max ZT0-3 211.5 211.5 211.5 ZT4-7 142.8 142.8 142.8 ZT8-11 194.2 194.2 194.2 ZT12-15 172.6 172.6 172.6 ZT16-19 99.39999999999999 99.39999999999999 99.39999999999999 ZT20-23 118.25 118.25 118.25