condition mean min max ZT0-3 10.224766 10.224766 10.224766 ZT4-7 11.9264955 11.9264955 11.9264955 ZT8-11 11.0602725 11.0602725 11.0602725 ZT12-15 10.4809515 10.4809515 10.4809515 ZT16-19 11.4854625 11.4854625 11.4854625 ZT20-23 11.999779499999999 11.999779499999999 11.999779499999999