condition mean min max ZT0-3 13.01515 13.01515 13.01515 ZT4-7 11.04795 11.04795 11.04795 ZT8-11 9.214490000000001 9.214490000000001 9.214490000000001 ZT12-15 9.913845 9.913845 9.913845 ZT16-19 11.54635 11.54635 11.54635 ZT20-23 12.310649999999999 12.310649999999999 12.310649999999999