condition mean min max ZT0-3 26.324199999999998 26.324199999999998 26.324199999999998 ZT4-7 21.18865 21.18865 21.18865 ZT8-11 26.68565 26.68565 26.68565 ZT12-15 19.04025 19.04025 19.04025 ZT16-19 28.0148 28.0148 28.0148 ZT20-23 24.41705 24.41705 24.41705