condition mean min max ZT0-3 37.03055 37.03055 37.03055 ZT4-7 31.3072 31.3072 31.3072 ZT8-11 35.3639 35.3639 35.3639 ZT12-15 38.4405 38.4405 38.4405 ZT16-19 45.86515 45.86515 45.86515 ZT20-23 38.9084 38.9084 38.9084