condition mean min max ZT0-3 5.903128333333333 5.329179999999999 6.890750000000001 ZT4-7 4.338615000000001 4.338615000000001 4.338615000000001 ZT8-11 3.3292 3.3292 3.3292 ZT12-15 3.4711675 3.37715 3.565185 ZT16-19 4.48641 4.48641 4.48641 ZT20-23 6.257210000000001 6.257210000000001 6.257210000000001