condition mean min max ZT0-3 61.960993 61.960993 61.960993 ZT4-7 67.0606965 67.0606965 67.0606965 ZT8-11 59.5947245 59.5947245 59.5947245 ZT12-15 106.33507650000001 106.33507650000001 106.33507650000001 ZT16-19 82.7706855 82.7706855 82.7706855 ZT20-23 108.9307175 108.9307175 108.9307175