condition mean min max ZT0-3 10.586879 10.586879 10.586879 ZT4-7 11.5426275 11.5426275 11.5426275 ZT8-11 13.5647885 13.5647885 13.5647885 ZT12-15 11.9103975 11.9103975 11.9103975 ZT16-19 11.1109275 11.1109275 11.1109275 ZT20-23 12.102104 12.102104 12.102104