condition mean min max ZT0-3 6593.950000000001 6593.950000000001 6593.950000000001 ZT4-7 5406.5 5406.5 5406.5 ZT8-11 4481.05 4481.05 4481.05 ZT12-15 5057.85 5057.85 5057.85 ZT16-19 6636.6 6636.6 6636.6 ZT20-23 6898.2 6898.2 6898.2