condition mean min max ZT0-3 4.62011 4.62011 4.62011 ZT4-7 2.39228 2.39228 2.39228 ZT8-11 3.6532 3.6532 3.6532 ZT12-15 5.18396 5.18396 5.18396 ZT16-19 6.700805 6.700805 6.700805 ZT20-23 4.7154 4.7154 4.7154