condition mean min max ZT0-3 595.578211 595.578211 595.578211 ZT4-7 448.18968800000005 448.18968800000005 448.18968800000005 ZT8-11 431.3689105 431.3689105 431.3689105 ZT12-15 470.841772 470.841772 470.841772 ZT16-19 424.276666 424.276666 424.276666 ZT20-23 416.169939 416.169939 416.169939