condition mean min max ZT0-3 35.72154008 35.49534158 35.94773858 ZT4-7 17.32502639 15.788112775 18.861940005 ZT8-11 11.756298872999999 10.429056671 13.083541075 ZT12-15 8.49357043675 8.0103891835 8.97675169 ZT16-19 9.41804724775 8.070691728 10.7654027675 ZT20-23 13.6897946675 13.61638336 13.763205975