condition mean min max ZT0-3 17.5807 17.5807 17.5807 ZT4-7 16.51215 16.51215 16.51215 ZT8-11 17.72035 17.72035 17.72035 ZT12-15 14.4865 14.4865 14.4865 ZT16-19 16.28085 16.28085 16.28085 ZT20-23 16.6527 16.6527 16.6527