condition mean min max ZT0-3 1.7174425 1.5451199999999998 1.8897650000000001 ZT4-7 1.27749 1.27749 1.27749 ZT8-11 5.478835 5.478835 5.478835 ZT12-15 0 0 0 ZT16-19 4.62754 4.62754 4.62754 ZT20-23 4.136835 4.136835 4.136835