condition mean min max ZT0-3 2.54772275 2.5151250000000003 2.5803205 ZT4-7 0.7598465000000001 0.7598465000000001 0.7598465000000001 ZT8-11 0.7602065 0.7602065 0.7602065 ZT12-15 0 0 0 ZT16-19 5.063245 5.063245 5.063245 ZT20-23 2.61218 2.61218 2.61218