condition mean min max ZT0-3 7.4812325 5.635415 9.32705 ZT4-7 11.37431 11.37431 11.37431 ZT8-11 6.259919999999999 6.259919999999999 6.259919999999999 ZT12-15 0 0 0 ZT16-19 8.674885 8.674885 8.674885 ZT20-23 27.6303 27.6303 27.6303