condition mean min max ZT0-3 54.239755074166666 51.49922204333333 56.980288105 ZT4-7 43.29851332 41.29304001 45.30398663 ZT8-11 53.061281065 52.10784183 54.0147203 ZT12-15 55.684423640000006 55.327995630000004 56.04085165 ZT16-19 60.67474152 60.535413346666665 60.81406969333334 ZT20-23 51.25220911666666 46.336886146666664 56.16753208666667