condition mean min max ZT0-3 11.197988 11.197988 11.197988 ZT4-7 8.743938 8.743938 8.743938 ZT8-11 9.890779 9.890779 9.890779 ZT12-15 10.7842235 10.7842235 10.7842235 ZT16-19 8.655843 8.655843 8.655843 ZT20-23 10.318343500000001 10.318343500000001 10.318343500000001