condition mean min max ZT0-3 15.830250000000001 14.861 16.799500000000002 ZT4-7 11.88925 11.88925 11.88925 ZT8-11 6.22494 6.22494 6.22494 ZT12-15 0 0 0 ZT16-19 16.412 16.412 16.412 ZT20-23 25.5964 25.5964 25.5964