condition mean min max ZT0-3 30.6492 28.71275 32.58565 ZT4-7 23.29305 23.29305 23.29305 ZT8-11 29.7518 29.7518 29.7518 ZT12-15 0 0 0 ZT16-19 36.58685 36.58685 36.58685 ZT20-23 32.97165 32.97165 32.97165