condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0168369 0.0168369 0.0168369 ZT12-15 0.019559016666666665 0.0162111 0.022906933333333334 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0