condition mean min max ZT0-3 2572.6 2572.6 2572.6 ZT4-7 3276.8 3276.8 3276.8 ZT8-11 3137.35 3137.35 3137.35 ZT12-15 2810.55 2810.55 2810.55 ZT16-19 2445.8500000000004 2445.8500000000004 2445.8500000000004 ZT20-23 2686.3500000000004 2686.3500000000004 2686.3500000000004