condition mean min max ZT0-3 388.869674 388.869674 388.869674 ZT4-7 473.86074 473.86074 473.86074 ZT8-11 536.4931409999999 536.4931409999999 536.4931409999999 ZT12-15 411.64150700000005 411.64150700000005 411.64150700000005 ZT16-19 465.5815965 465.5815965 465.5815965 ZT20-23 426.96597199999997 426.96597199999997 426.96597199999997