condition mean min max ZT0-3 72.12265 59.5737 84.6716 ZT4-7 14.228 14.228 14.228 ZT8-11 10.905750000000001 10.905750000000001 10.905750000000001 ZT12-15 0 0 0 ZT16-19 43.4114 43.4114 43.4114 ZT20-23 51.2445 51.2445 51.2445