condition mean min max ZT0-3 12.117625 12.032499999999999 12.20275 ZT4-7 3.58965 3.58965 3.58965 ZT8-11 1.785225 1.785225 1.785225 ZT12-15 0 0 0 ZT16-19 10.8371 10.8371 10.8371 ZT20-23 12.48975 12.48975 12.48975