condition mean min max ZT0-3 1.6111710000000001 1.6111710000000001 1.6111710000000001 ZT4-7 21.0497 21.0497 21.0497 ZT8-11 7.77426 7.77426 7.77426 ZT12-15 0.5297864999999999 0.5297864999999999 0.5297864999999999 ZT16-19 0.0 0.0 0.0 ZT20-23 0.1420843333333333 0.1420843333333333 0.1420843333333333