condition mean min max ZT0-3 67.46338333333334 54.6081 81.40765 ZT4-7 75.7286 75.7286 75.7286 ZT8-11 46.1219 46.1219 46.1219 ZT12-15 31.920575 31.36215 32.479 ZT16-19 35.218 35.218 35.218 ZT20-23 51.529849999999996 51.529849999999996 51.529849999999996