condition mean min max ZT0-3 87.340825 79.32395 95.3577 ZT4-7 72.2298 72.2298 72.2298 ZT8-11 65.59565 65.59565 65.59565 ZT12-15 0 0 0 ZT16-19 94.57345000000001 94.57345000000001 94.57345000000001 ZT20-23 86.5262 86.5262 86.5262