condition mean min max ZT0-3 12.652750000000001 11.63155 13.67395 ZT4-7 20.392200000000003 20.392200000000003 20.392200000000003 ZT8-11 38.11865 38.11865 38.11865 ZT12-15 0 0 0 ZT16-19 31.79545 31.79545 31.79545 ZT20-23 16.98215 16.98215 16.98215