condition mean min max ZT0-3 2144.6 2144.6 2144.6 ZT4-7 1830.0 1830.0 1830.0 ZT8-11 2476.95 2476.95 2476.95 ZT12-15 3930.8999999999996 3930.8999999999996 3930.8999999999996 ZT16-19 4314.25 4314.25 4314.25 ZT20-23 3307.3500000000004 3307.3500000000004 3307.3500000000004