condition mean min max ZT0-3 742.331481 742.331481 742.331481 ZT4-7 449.4977755 449.4977755 449.4977755 ZT8-11 412.744599 412.744599 412.744599 ZT12-15 433.4049725 433.4049725 433.4049725 ZT16-19 434.44604400000003 434.44604400000003 434.44604400000003 ZT20-23 452.012208 452.012208 452.012208