condition mean min max ZT0-3 32.95305 32.95305 32.95305 ZT4-7 32.5025 32.5025 32.5025 ZT8-11 31.6047 31.6047 31.6047 ZT12-15 33.90025 33.90025 33.90025 ZT16-19 34.2575 34.2575 34.2575 ZT20-23 29.119 29.119 29.119