condition mean min max ZT0-3 56.34765 52.2472 61.278 ZT4-7 49.55385 49.55385 49.55385 ZT8-11 40.75995 40.75995 40.75995 ZT12-15 55.624624999999995 51.79315 59.4561 ZT16-19 65.5212 65.5212 65.5212 ZT20-23 54.65345 54.65345 54.65345