condition mean min max ZT0-3 2.80003200275 2.7752301545 2.824833851 ZT4-7 2.1920959155 2.067229991 2.31696184 ZT8-11 3.1238264185 2.797261408 3.450391429 ZT12-15 4.33871842975 3.3857616285 5.291675231 ZT16-19 3.383002681 3.3375974035000002 3.4284079585 ZT20-23 4.68688384475 4.3868158195 4.98695187