condition mean min max ZT0-3 6.465675 5.67187 7.25948 ZT4-7 0.7765085 0.7765085 0.7765085 ZT8-11 1.1341135 1.1341135 1.1341135 ZT12-15 0 0 0 ZT16-19 8.31405 8.31405 8.31405 ZT20-23 5.135875 5.135875 5.135875