condition mean min max ZT0-3 22.520325 22.2163 22.824350000000003 ZT4-7 13.21745 13.21745 13.21745 ZT8-11 12.997499999999999 12.997499999999999 12.997499999999999 ZT12-15 0 0 0 ZT16-19 15.22975 15.22975 15.22975 ZT20-23 16.6754 16.6754 16.6754