condition mean min max ZT0-3 14.344000000000001 14.344000000000001 14.344000000000001 ZT4-7 12.5506 12.5506 12.5506 ZT8-11 12.88305 12.88305 12.88305 ZT12-15 16.7547 16.7547 16.7547 ZT16-19 19.640349999999998 19.640349999999998 19.640349999999998 ZT20-23 19.50745 19.50745 19.50745