condition mean min max ZT0-3 9.342144 9.342144 9.342144 ZT4-7 10.599616999999999 10.599616999999999 10.599616999999999 ZT8-11 11.317294 11.317294 11.317294 ZT12-15 9.959187499999999 9.959187499999999 9.959187499999999 ZT16-19 9.8999785 9.8999785 9.8999785 ZT20-23 10.6633105 10.6633105 10.6633105