condition mean min max ZT0-3 30.557533333333332 13.3355 45.860749999999996 ZT4-7 15.6074 15.6074 15.6074 ZT8-11 16.15711 16.15711 16.15711 ZT12-15 36.792375 26.9391 46.64565 ZT16-19 19.778585 19.778585 19.778585 ZT20-23 27.486 27.486 27.486