condition mean min max ZT0-3 6.9526225 6.52041 7.384835 ZT4-7 6.538589999999999 6.538589999999999 6.538589999999999 ZT8-11 2.61515 2.61515 2.61515 ZT12-15 0 0 0 ZT16-19 5.899039999999999 5.899039999999999 5.899039999999999 ZT20-23 10.30447 10.30447 10.30447