condition mean min max ZT0-3 267.30898 267.30898 267.30898 ZT4-7 321.3141695 321.3141695 321.3141695 ZT8-11 370.87991750000003 370.87991750000003 370.87991750000003 ZT12-15 329.86907099999996 329.86907099999996 329.86907099999996 ZT16-19 285.36765249999996 285.36765249999996 285.36765249999996 ZT20-23 383.01926100000003 383.01926100000003 383.01926100000003