condition mean min max ZT0-3 1.19926775 0.6999205 1.698615 ZT4-7 1.422155 1.422155 1.422155 ZT8-11 2.42274 2.42274 2.42274 ZT12-15 0 0 0 ZT16-19 2.3653 2.3653 2.3653 ZT20-23 1.8163200000000002 1.8163200000000002 1.8163200000000002