condition mean min max ZT0-3 16.0978 16.0978 16.0978 ZT4-7 5.706189999999999 5.706189999999999 5.706189999999999 ZT8-11 14.209900000000001 14.209900000000001 14.209900000000001 ZT12-15 18.7448 18.7448 18.7448 ZT16-19 21.8583 21.8583 21.8583 ZT20-23 16.906 16.906 16.906