condition mean min max ZT0-3 23.7354 23.7354 23.7354 ZT4-7 18.6914 18.6914 18.6914 ZT8-11 18.18965 18.18965 18.18965 ZT12-15 22.0688 22.0688 22.0688 ZT16-19 28.18105 28.18105 28.18105 ZT20-23 24.847299999999997 24.847299999999997 24.847299999999997