condition mean min max ZT0-3 4.4297249999999995 4.4297249999999995 4.4297249999999995 ZT4-7 9.702195 9.702195 9.702195 ZT8-11 4.670685 4.670685 4.670685 ZT12-15 2.0389150000000003 2.0389150000000003 2.0389150000000003 ZT16-19 0.575151 0.575151 0.575151 ZT20-23 2.084115 2.084115 2.084115