condition mean min max ZT0-3 2.0595165 1.396585 3.16946 ZT4-7 2.10622 2.10622 2.10622 ZT8-11 1.5128249999999999 1.5128249999999999 1.5128249999999999 ZT12-15 0.7835237500000001 0.5737460000000001 0.9933015000000001 ZT16-19 0.5187395 0.5187395 0.5187395 ZT20-23 3.1777100000000003 3.1777100000000003 3.1777100000000003