condition mean min max ZT0-3 14.283075 13.5351 15.03105 ZT4-7 10.97175 10.97175 10.97175 ZT8-11 19.34675 19.34675 19.34675 ZT12-15 0 0 0 ZT16-19 20.86045 20.86045 20.86045 ZT20-23 16.00515 16.00515 16.00515