condition mean min max ZT0-3 803.155134 803.155134 803.155134 ZT4-7 814.798274 814.798274 814.798274 ZT8-11 858.9706550000001 858.9706550000001 858.9706550000001 ZT12-15 792.951108 792.951108 792.951108 ZT16-19 771.2466415 771.2466415 771.2466415 ZT20-23 834.212826 834.212826 834.212826