condition mean min max ZT0-3 1.93368483125 1.892655084 1.9747145785 ZT4-7 1.20824752125 1.057701002 1.3587940404999999 ZT8-11 2.97429758225 2.073887104 3.8747080605 ZT12-15 3.413811072 3.0661887895 3.7614333545000003 ZT16-19 2.70181985375 2.6858782835 2.717761424 ZT20-23 2.58491628875 2.1964154625 2.973417115