condition mean min max ZT0-3 1570.689784 1570.689784 1570.689784 ZT4-7 1569.4849765 1569.4849765 1569.4849765 ZT8-11 1692.7264854999999 1692.7264854999999 1692.7264854999999 ZT12-15 1644.0622425000001 1644.0622425000001 1644.0622425000001 ZT16-19 1538.40474 1538.40474 1538.40474 ZT20-23 1250.651394 1250.651394 1250.651394