condition mean min max ZT0-3 2.886825 2.738085 3.035565 ZT4-7 2.939245 2.939245 2.939245 ZT8-11 5.3253699999999995 5.3253699999999995 5.3253699999999995 ZT12-15 0 0 0 ZT16-19 6.492654999999999 6.492654999999999 6.492654999999999 ZT20-23 5.301265000000001 5.301265000000001 5.301265000000001