condition mean min max ZT0-3 3.0641425 2.771575 3.35671 ZT4-7 0.733923 0.733923 0.733923 ZT8-11 0.546285 0.546285 0.546285 ZT12-15 0 0 0 ZT16-19 2.3380099999999997 2.3380099999999997 2.3380099999999997 ZT20-23 0.9642055 0.9642055 0.9642055