condition mean min max ZT0-3 9.518298333333332 8.498095 10.237385 ZT4-7 5.366085 5.366085 5.366085 ZT8-11 5.546735 5.546735 5.546735 ZT12-15 14.2044625 9.817625 18.5913 ZT16-19 23.838 23.838 23.838 ZT20-23 14.955295 14.955295 14.955295