condition mean min max ZT0-3 14.132401 14.132401 14.132401 ZT4-7 16.68239 16.68239 16.68239 ZT8-11 15.775758999999999 15.775758999999999 15.775758999999999 ZT12-15 16.458254 16.458254 16.458254 ZT16-19 19.872095 19.872095 19.872095 ZT20-23 20.962736 20.962736 20.962736