condition mean min max ZT0-3 25.814349999999997 25.814349999999997 25.814349999999997 ZT4-7 28.5506 28.5506 28.5506 ZT8-11 27.6117 27.6117 27.6117 ZT12-15 24.055799999999998 24.055799999999998 24.055799999999998 ZT16-19 18.3423 18.3423 18.3423 ZT20-23 23.847749999999998 23.847749999999998 23.847749999999998