condition mean min max ZT0-3 91.349292 91.349292 91.349292 ZT4-7 65.209589 65.209589 65.209589 ZT8-11 110.479236 110.479236 110.479236 ZT12-15 113.01823 113.01823 113.01823 ZT16-19 157.2901065 157.2901065 157.2901065 ZT20-23 125.885142 125.885142 125.885142