condition mean min max ZT0-3 2.070555 2.070555 2.070555 ZT4-7 4.492039999999999 4.492039999999999 4.492039999999999 ZT8-11 3.42673 3.42673 3.42673 ZT12-15 2.9756 2.9756 2.9756 ZT16-19 7.886405 7.886405 7.886405 ZT20-23 4.28922 4.28922 4.28922