condition mean min max ZT0-3 9.034459 9.034459 9.034459 ZT4-7 12.441319499999999 12.441319499999999 12.441319499999999 ZT8-11 10.9970435 10.9970435 10.9970435 ZT12-15 9.517609499999999 9.517609499999999 9.517609499999999 ZT16-19 10.047422000000001 10.047422000000001 10.047422000000001 ZT20-23 11.00302 11.00302 11.00302