condition mean min max ZT0-3 13.592127 13.592127 13.592127 ZT4-7 11.1449715 11.1449715 11.1449715 ZT8-11 13.799138 13.799138 13.799138 ZT12-15 20.017784 20.017784 20.017784 ZT16-19 28.6715395 28.6715395 28.6715395 ZT20-23 165.5644435 165.5644435 165.5644435