condition mean min max ZT0-3 13.69342 13.69342 13.69342 ZT4-7 13.227004 13.227004 13.227004 ZT8-11 14.856962500000002 14.856962500000002 14.856962500000002 ZT12-15 14.919063000000001 14.919063000000001 14.919063000000001 ZT16-19 14.774877 14.774877 14.774877 ZT20-23 14.691254999999998 14.691254999999998 14.691254999999998