High reading and low writing

To reduce waiting quota, keepalive_timeout was set to 3.

While the status shows as below,

Active connections: 1850
server accepts handled requests
14387580 14387580 15330890
Reading: 1312 Writing: 6 Waiting: 532

My question is, why nginx has so large reading/writing ratio?Thx!

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,228717,228717#msg-228717