condition mean min max ZT0-3 4487.115524 4487.115524 4487.115524 ZT4-7 4334.674027999999 4334.674027999999 4334.674027999999 ZT8-11 4632.7284335 4632.7284335 4632.7284335 ZT12-15 4818.604019 4818.604019 4818.604019 ZT16-19 4701.777149 4701.777149 4701.777149 ZT20-23 3996.0903710000002 3996.0903710000002 3996.0903710000002