condition mean min max ZT0-3 8.772612500000001 8.770085 8.77514 ZT4-7 5.657455000000001 5.657455000000001 5.657455000000001 ZT8-11 4.72087 4.72087 4.72087 ZT12-15 0 0 0 ZT16-19 7.939375 7.939375 7.939375 ZT20-23 8.32329 8.32329 8.32329