condition mean min max ZT0-3 40.96655 40.96655 40.96655 ZT4-7 41.7948 41.7948 41.7948 ZT8-11 26.65475 26.65475 26.65475 ZT12-15 25.077350000000003 25.077350000000003 25.077350000000003 ZT16-19 21.6394 21.6394 21.6394 ZT20-23 34.2986 34.2986 34.2986