condition mean min max ZT0-3 0.6338235 0.6338235 0.6338235 ZT4-7 1.367875 1.367875 1.367875 ZT8-11 0.949211 0.949211 0.949211 ZT12-15 0.7271194999999999 0.7271194999999999 0.7271194999999999 ZT16-19 0.6626650000000001 0.6626650000000001 0.6626650000000001 ZT20-23 0.4280925 0.4280925 0.4280925