condition mean min max ZT0-3 316.557286 316.557286 316.557286 ZT4-7 155.0459565 155.0459565 155.0459565 ZT8-11 45.2383945 45.2383945 45.2383945 ZT12-15 17.617243000000002 17.617243000000002 17.617243000000002 ZT16-19 99.084827 99.084827 99.084827 ZT20-23 279.161777 279.161777 279.161777