condition mean min max ZT0-3 11.613742 11.613742 11.613742 ZT4-7 12.444519 12.444519 12.444519 ZT8-11 12.846898 12.846898 12.846898 ZT12-15 11.2953725 11.2953725 11.2953725 ZT16-19 11.0202295 11.0202295 11.0202295 ZT20-23 10.8347275 10.8347275 10.8347275