condition mean min max ZT0-3 0.33550100000000005 0.3153305 0.35567150000000003 ZT4-7 0.180474 0.180474 0.180474 ZT8-11 0.329552 0.329552 0.329552 ZT12-15 0 0 0 ZT16-19 0.2951045 0.2951045 0.2951045 ZT20-23 0.4461465 0.4461465 0.4461465