condition mean min max ZT0-3 13.030368 13.030368 13.030368 ZT4-7 9.8334235 9.8334235 9.8334235 ZT8-11 11.982184 11.982184 11.982184 ZT12-15 10.4291015 10.4291015 10.4291015 ZT16-19 11.577901 11.577901 11.577901 ZT20-23 9.944571 9.944571 9.944571