condition mean min max ZT0-3 0.30244550000000003 0.30244550000000003 0.30244550000000003 ZT4-7 0.311245 0.311245 0.311245 ZT8-11 0.4368025 0.4368025 0.4368025 ZT12-15 0.391125 0.391125 0.391125 ZT16-19 0.31957250000000004 0.31957250000000004 0.31957250000000004 ZT20-23 0.1501605 0.1501605 0.1501605