condition mean min max ZT0-3 8.3055725 5.903945 10.7072 ZT4-7 0.8807514999999999 0.8807514999999999 0.8807514999999999 ZT8-11 1.4309785 1.4309785 1.4309785 ZT12-15 0 0 0 ZT16-19 4.2334700000000005 4.2334700000000005 4.2334700000000005 ZT20-23 3.37979 3.37979 3.37979