condition mean min max ZT0-3 9.213926 9.213926 9.213926 ZT4-7 10.067187 10.067187 10.067187 ZT8-11 8.378452 8.378452 8.378452 ZT12-15 9.4230395 9.4230395 9.4230395 ZT16-19 8.697173 8.697173 8.697173 ZT20-23 9.3849905 9.3849905 9.3849905