condition mean min max ZT0-3 6.74062 6.74062 6.74062 ZT4-7 11.063395 11.063395 11.063395 ZT8-11 13.7239 13.7239 13.7239 ZT12-15 9.749780000000001 9.749780000000001 9.749780000000001 ZT16-19 11.046195 11.046195 11.046195 ZT20-23 6.091175 6.091175 6.091175