condition mean min max ZT0-3 38.39365 27.3788 44.74415 ZT4-7 33.4047 33.4047 33.4047 ZT8-11 32.9242 32.9242 32.9242 ZT12-15 35.201975 34.616 35.787949999999995 ZT16-19 37.845 37.845 37.845 ZT20-23 48.03595 48.03595 48.03595