condition mean min max ZT0-3 119.939406 119.939406 119.939406 ZT4-7 92.1827565 92.1827565 92.1827565 ZT8-11 86.1154675 86.1154675 86.1154675 ZT12-15 85.79819 85.79819 85.79819 ZT16-19 95.244162 95.244162 95.244162 ZT20-23 86.2922455 86.2922455 86.2922455