condition mean min max ZT0-3 2274.25 2274.25 2274.25 ZT4-7 2790.9 2790.9 2790.9 ZT8-11 2589.85 2589.85 2589.85 ZT12-15 2794.05 2794.05 2794.05 ZT16-19 2941.3500000000004 2941.3500000000004 2941.3500000000004 ZT20-23 2418.95 2418.95 2418.95