condition mean min max ZT0-3 368.144732 368.144732 368.144732 ZT4-7 220.2261585 220.2261585 220.2261585 ZT8-11 192.24645049999998 192.24645049999998 192.24645049999998 ZT12-15 224.080614 224.080614 224.080614 ZT16-19 316.48823649999997 316.48823649999997 316.48823649999997 ZT20-23 300.278793 300.278793 300.278793