condition mean min max ZT0-3 20.931825 19.3305 22.53315 ZT4-7 24.6997 24.6997 24.6997 ZT8-11 39.7262 39.7262 39.7262 ZT12-15 0 0 0 ZT16-19 45.132000000000005 45.132000000000005 45.132000000000005 ZT20-23 36.58785 36.58785 36.58785