condition mean min max ZT0-3 0.028864166666666666 0.0 0.0865925 ZT4-7 0.0 0.0 0.0 ZT8-11 0.159306 0.159306 0.159306 ZT12-15 0.36814824999999995 0.3384 0.3978965 ZT16-19 0.2251945 0.2251945 0.2251945 ZT20-23 0.0 0.0 0.0