condition mean min max ZT0-3 11.716684 11.716684 11.716684 ZT4-7 11.836965 11.836965 11.836965 ZT8-11 13.557459999999999 13.557459999999999 13.557459999999999 ZT12-15 10.601298 10.601298 10.601298 ZT16-19 11.419317 11.419317 11.419317 ZT20-23 11.4018505 11.4018505 11.4018505