condition mean min max ZT0-3 1125.873248 1125.873248 1125.873248 ZT4-7 529.9488249999999 529.9488249999999 529.9488249999999 ZT8-11 365.685806 365.685806 365.685806 ZT12-15 499.95040200000005 499.95040200000005 499.95040200000005 ZT16-19 221.3222255 221.3222255 221.3222255 ZT20-23 155.2097255 155.2097255 155.2097255