According to Ure Pia magazine, Ascii Research Institute has released a comparative analysis of K-ON! fans. They concluded that the anime has appealed to the general public, especially young women, who don’t watch anime frequently.
The sex ratio of anime fans of four titles
37% of K-ON! fans are women while women make up only 10% of Strike Witches 2 fans.
Percentage of people who don’t watch anime frequently
15% of the audience of K-ON! anime don’t watch other anime frequently, while all the audience of Mahou Shoujo Madoka★Magica anime watch other anime as well.
Age distribution of K-ON! fans
K-ON! fans show a wide range of age distribution. People in their 20s have the largest population both in male and female fans.
Source: Scan of UrePia, Scan 2