condition mean min max ZT0-3 1262.7 1262.7 1262.7 ZT4-7 847.9 847.9 847.9 ZT8-11 694.5 694.5 694.5 ZT12-15 675.75 675.75 675.75 ZT16-19 993.1500000000001 993.1500000000001 993.1500000000001 ZT20-23 1380.8000000000002 1380.8000000000002 1380.8000000000002