condition mean min max ZT0-3 73.9174 58.0347 89.8001 ZT4-7 27.182450000000003 27.182450000000003 27.182450000000003 ZT8-11 9.82362 9.82362 9.82362 ZT12-15 0 0 0 ZT16-19 21.6148 21.6148 21.6148 ZT20-23 33.4453 33.4453 33.4453