condition mean min max ZT0-3 300.611779 300.611779 300.611779 ZT4-7 135.877108 135.877108 135.877108 ZT8-11 145.1462775 145.1462775 145.1462775 ZT12-15 230.7516005 230.7516005 230.7516005 ZT16-19 380.26906049999997 380.26906049999997 380.26906049999997 ZT20-23 338.4864145 338.4864145 338.4864145