condition mean min max ZT0-3 3.357005 3.357005 3.357005 ZT4-7 3.112395 3.112395 3.112395 ZT8-11 2.4228300000000003 2.4228300000000003 2.4228300000000003 ZT12-15 2.980805 2.980805 2.980805 ZT16-19 4.08974 4.08974 4.08974 ZT20-23 3.422255 3.422255 3.422255