condition mean min max ZT0-3 16.75565 14.77055 18.74075 ZT4-7 12.159600000000001 12.159600000000001 12.159600000000001 ZT8-11 14.364165 14.364165 14.364165 ZT12-15 0 0 0 ZT16-19 18.6744 18.6744 18.6744 ZT20-23 19.305300000000003 19.305300000000003 19.305300000000003