condition mean min max ZT0-3 25.25645 25.25645 25.25645 ZT4-7 16.6004055 16.6004055 16.6004055 ZT8-11 14.266868500000001 14.266868500000001 14.266868500000001 ZT12-15 17.4039205 17.4039205 17.4039205 ZT16-19 11.5337695 11.5337695 11.5337695 ZT20-23 11.5454405 11.5454405 11.5454405