condition mean min max ZT0-3 13.8971 13.8971 13.8971 ZT4-7 10.456365 10.456365 10.456365 ZT8-11 13.5965 13.5965 13.5965 ZT12-15 13.2777 13.2777 13.2777 ZT16-19 14.6945 14.6945 14.6945 ZT20-23 12.149799999999999 12.149799999999999 12.149799999999999