condition mean min max ZT0-3 424.808329 424.808329 424.808329 ZT4-7 456.68695449999996 456.68695449999996 456.68695449999996 ZT8-11 423.20845199999997 423.20845199999997 423.20845199999997 ZT12-15 442.5705325 442.5705325 442.5705325 ZT16-19 297.794358 297.794358 297.794358 ZT20-23 249.7003165 249.7003165 249.7003165