condition mean min max ZT0-3 0.18701162500000001 0.13317175 0.2408515 ZT4-7 0.243572 0.243572 0.243572 ZT8-11 0.4002165 0.4002165 0.4002165 ZT12-15 0 0 0 ZT16-19 0.30569199999999996 0.30569199999999996 0.30569199999999996 ZT20-23 0.3502015 0.3502015 0.3502015