condition mean min max ZT0-3 0.040303 0.0 0.120909 ZT4-7 0.35056699999999996 0.35056699999999996 0.35056699999999996 ZT8-11 0.3648965 0.3648965 0.3648965 ZT12-15 0.37250125 0.121253 0.6237495 ZT16-19 0.679195 0.679195 0.679195 ZT20-23 0.260222 0.260222 0.260222