condition mean min max ZT0-3 0.2224433 0.0843549 0.3325845 ZT4-7 0.1599541 0.1599541 0.1599541 ZT8-11 0.5318309999999999 0.5318309999999999 0.5318309999999999 ZT12-15 0.5283882499999999 0.46035649999999995 0.59642 ZT16-19 0.6927045 0.6927045 0.6927045 ZT20-23 0.261594 0.261594 0.261594