condition mean min max ZT0-3 34.41988081 29.92978723 38.90997439 ZT4-7 29.526008122500002 24.945322195000003 34.10669405 ZT8-11 41.8656373325 29.238086270000004 54.493188395000004 ZT12-15 55.4294558225 51.930374580000006 58.928537065 ZT16-19 59.191030255 56.71240951 61.669651 ZT20-23 73.5123046875 70.77230471 76.252304665