condition mean min max ZT0-3 7.7521875 5.94834 9.556035 ZT4-7 12.1092 12.1092 12.1092 ZT8-11 16.42335 16.42335 16.42335 ZT12-15 0 0 0 ZT16-19 19.17945 19.17945 19.17945 ZT20-23 11.4655 11.4655 11.4655