condition mean min max ZT0-3 5.4124574999999995 4.269909999999999 6.5550049999999995 ZT4-7 1.80431 1.80431 1.80431 ZT8-11 0.9738655 0.9738655 0.9738655 ZT12-15 0 0 0 ZT16-19 2.06097 2.06097 2.06097 ZT20-23 2.4315550000000004 2.4315550000000004 2.4315550000000004