condition mean min max ZT0-3 0.0333947 0.0333947 0.0333947 ZT4-7 0.0442622 0.0442622 0.0442622 ZT8-11 0.02736095 0.02736095 0.02736095 ZT12-15 0.019910070000000002 0.019910070000000002 0.019910070000000002 ZT16-19 0.0771406 0.0771406 0.0771406 ZT20-23 0.022706399999999998 0.022706399999999998 0.022706399999999998