condition mean min max ZT0-3 968.5951666666666 902.02 1067.1565 ZT4-7 1083.33 1083.33 1083.33 ZT8-11 700.4175 700.4175 700.4175 ZT12-15 411.08349999999996 327.55949999999996 494.60749999999996 ZT16-19 526.8355 526.8355 526.8355 ZT20-23 659.4014999999999 659.4014999999999 659.4014999999999