condition mean min max ZT0-3 17.161900000000003 15.03605 19.287750000000003 ZT4-7 10.108175 10.108175 10.108175 ZT8-11 12.250250000000001 12.250250000000001 12.250250000000001 ZT12-15 0 0 0 ZT16-19 13.485949999999999 13.485949999999999 13.485949999999999 ZT20-23 13.719850000000001 13.719850000000001 13.719850000000001