condition mean min max ZT0-3 12.144549999999999 12.1337 12.1554 ZT4-7 9.181805 9.181805 9.181805 ZT8-11 9.10956 9.10956 9.10956 ZT12-15 0 0 0 ZT16-19 15.164100000000001 15.164100000000001 15.164100000000001 ZT20-23 13.731349999999999 13.731349999999999 13.731349999999999