condition mean min max ZT0-3 27.01425 26.0897 27.9388 ZT4-7 10.535225 10.535225 10.535225 ZT8-11 3.970745 3.970745 3.970745 ZT12-15 0 0 0 ZT16-19 6.037125 6.037125 6.037125 ZT20-23 16.43385 16.43385 16.43385