condition mean min max ZT0-3 145.770518 145.770518 145.770518 ZT4-7 220.2242035 220.2242035 220.2242035 ZT8-11 152.357212 152.357212 152.357212 ZT12-15 115.5507545 115.5507545 115.5507545 ZT16-19 143.897915 143.897915 143.897915 ZT20-23 158.21618949999998 158.21618949999998 158.21618949999998