condition mean min max ZT0-3 7.23004 5.7684 8.044445 ZT4-7 5.52612 5.52612 5.52612 ZT8-11 9.266635 9.266635 9.266635 ZT12-15 24.80575 24.45525 25.15625 ZT16-19 16.9053 16.9053 16.9053 ZT20-23 16.7639 16.7639 16.7639