condition mean min max ZT0-3 281.49266666666665 261.11850000000004 306.3105 ZT4-7 293.46349999999995 293.46349999999995 293.46349999999995 ZT8-11 308.9705 308.9705 308.9705 ZT12-15 288.49375000000003 257.946 319.04150000000004 ZT16-19 368.9295 368.9295 368.9295 ZT20-23 363.3275 363.3275 363.3275