condition mean min max ZT0-3 37.38014 37.38014 37.38014 ZT4-7 37.3316095 37.3316095 37.3316095 ZT8-11 31.235861 31.235861 31.235861 ZT12-15 30.453104 30.453104 30.453104 ZT16-19 58.0214835 58.0214835 58.0214835 ZT20-23 65.571985 65.571985 65.571985