condition mean min max ZT0-3 73.618989 73.618989 73.618989 ZT4-7 110.7912575 110.7912575 110.7912575 ZT8-11 76.18308049999999 76.18308049999999 76.18308049999999 ZT12-15 80.304835 80.304835 80.304835 ZT16-19 69.069074 69.069074 69.069074 ZT20-23 80.26618049999999 80.26618049999999 80.26618049999999