condition mean min max ZT0-3 2.27245 1.9797600000000002 2.56514 ZT4-7 1.53156 1.53156 1.53156 ZT8-11 1.4269150000000002 1.4269150000000002 1.4269150000000002 ZT12-15 0 0 0 ZT16-19 1.89167 1.89167 1.89167 ZT20-23 1.79098 1.79098 1.79098