condition mean min max ZT0-3 11.681473269000001 7.781993783 15.580952755000002 ZT4-7 34.107301715000006 29.272440080000003 38.94216335 ZT8-11 54.74505298 44.96743409 64.52267187 ZT12-15 39.7339648225 27.3353769 52.132552745 ZT16-19 17.6033164325 17.1748356 18.031797265 ZT20-23 19.71455849 18.37738972 21.05172726