condition mean min max ZT0-3 24.135344 24.135344 24.135344 ZT4-7 32.44221 32.44221 32.44221 ZT8-11 46.990725 46.990725 46.990725 ZT12-15 30.9652515 30.9652515 30.9652515 ZT16-19 37.8296755 37.8296755 37.8296755 ZT20-23 26.5603135 26.5603135 26.5603135