condition mean min max ZT0-3 11.805043 11.805043 11.805043 ZT4-7 11.828773 11.828773 11.828773 ZT8-11 12.128440999999999 12.128440999999999 12.128440999999999 ZT12-15 11.158531 11.158531 11.158531 ZT16-19 11.224198 11.224198 11.224198 ZT20-23 10.959905 10.959905 10.959905