condition mean min max ZT0-3 1.064522 0.166579 1.962465 ZT4-7 0.1681205 0.1681205 0.1681205 ZT8-11 0.59045 0.59045 0.59045 ZT12-15 0 0 0 ZT16-19 0.41933549999999997 0.41933549999999997 0.41933549999999997 ZT20-23 0.2526145 0.2526145 0.2526145