condition mean min max ZT0-3 52.434387 52.434387 52.434387 ZT4-7 77.628668 77.628668 77.628668 ZT8-11 82.47260349999999 82.47260349999999 82.47260349999999 ZT12-15 64.61529949999999 64.61529949999999 64.61529949999999 ZT16-19 86.5882365 86.5882365 86.5882365 ZT20-23 71.887003 71.887003 71.887003