condition mean min max ZT0-3 46.445800000000006 41.5439 51.3477 ZT4-7 63.1691 63.1691 63.1691 ZT8-11 57.51675 57.51675 57.51675 ZT12-15 0 0 0 ZT16-19 71.14525 71.14525 71.14525 ZT20-23 70.9276 70.9276 70.9276