condition mean min max ZT0-3 9.52569 6.720470000000001 11.5823 ZT4-7 9.637335 9.637335 9.637335 ZT8-11 6.3436699999999995 6.3436699999999995 6.3436699999999995 ZT12-15 8.5336175 7.62879 9.438445 ZT16-19 11.386600000000001 11.386600000000001 11.386600000000001 ZT20-23 13.3438 13.3438 13.3438