condition mean min max ZT0-3 323.346377 323.346377 323.346377 ZT4-7 266.505174 266.505174 266.505174 ZT8-11 314.4405195 314.4405195 314.4405195 ZT12-15 364.86828249999996 364.86828249999996 364.86828249999996 ZT16-19 384.70438850000005 384.70438850000005 384.70438850000005 ZT20-23 347.6311935 347.6311935 347.6311935