condition mean min max ZT0-3 1.69584 1.54603 1.84565 ZT4-7 1.143989 1.143989 1.143989 ZT8-11 0.900447 0.900447 0.900447 ZT12-15 0 0 0 ZT16-19 1.3275325 1.3275325 1.3275325 ZT20-23 1.50022 1.50022 1.50022