condition mean min max ZT0-3 1.1556600000000001 1.1556600000000001 1.1556600000000001 ZT4-7 2.70259 2.70259 2.70259 ZT8-11 4.783989999999999 4.783989999999999 4.783989999999999 ZT12-15 1.716995 1.716995 1.716995 ZT16-19 0.80699 0.80699 0.80699 ZT20-23 0.972553 0.972553 0.972553