condition mean min max ZT0-3 4.70894 4.210915 5.206965 ZT4-7 4.501755 4.501755 4.501755 ZT8-11 4.50716 4.50716 4.50716 ZT12-15 0 0 0 ZT16-19 4.392435 4.392435 4.392435 ZT20-23 4.422765 4.422765 4.422765