condition mean min max ZT0-3 0.365202 0.24644100000000002 0.483963 ZT4-7 0.433145 0.433145 0.433145 ZT8-11 0.557145 0.557145 0.557145 ZT12-15 0 0 0 ZT16-19 0.7872245 0.7872245 0.7872245 ZT20-23 0.7303725 0.7303725 0.7303725