condition mean min max ZT0-3 46.39555 46.39555 46.39555 ZT4-7 40.4386 40.4386 40.4386 ZT8-11 42.1308 42.1308 42.1308 ZT12-15 39.44345 39.44345 39.44345 ZT16-19 47.21795 47.21795 47.21795 ZT20-23 44.4932 44.4932 44.4932