condition mean min max ZT0-3 11.10105 11.10105 11.10105 ZT4-7 6.7625399999999996 6.7625399999999996 6.7625399999999996 ZT8-11 4.734615 4.734615 4.734615 ZT12-15 9.11579 9.11579 9.11579 ZT16-19 15.857 15.857 15.857 ZT20-23 15.1556 15.1556 15.1556