condition mean min max ZT0-3 17.426675 17.232 17.62135 ZT4-7 16.43745 16.43745 16.43745 ZT8-11 16.3272 16.3272 16.3272 ZT12-15 0 0 0 ZT16-19 23.348399999999998 23.348399999999998 23.348399999999998 ZT20-23 13.8736 13.8736 13.8736