condition mean min max ZT0-3 1.9067655000000001 1.415591 2.39794 ZT4-7 4.31239 4.31239 4.31239 ZT8-11 1.8052745 1.8052745 1.8052745 ZT12-15 0 0 0 ZT16-19 1.74104 1.74104 1.74104 ZT20-23 2.25456 2.25456 2.25456