condition mean min max ZT0-3 1.61133025 1.0156605 2.207 ZT4-7 2.027405 2.027405 2.027405 ZT8-11 0.8146180000000001 0.8146180000000001 0.8146180000000001 ZT12-15 0 0 0 ZT16-19 1.7975349999999999 1.7975349999999999 1.7975349999999999 ZT20-23 1.605505 1.605505 1.605505