Nginx stats - why _handled_ value differs (no replies)

Hi,

Stats from server:

$ curl 'http://127.0.0.1/nginx-stats'; sleep 1; curl 'http://127.0.0.1/nginx-stats'
Active connections: 25849
server accepts handled requests
917796 917796 13323443
Reading: 0 Writing: 668 Waiting: 25180
Active connections: 25860
server accepts handled requests
918627 918627 13337317
Reading: 0 Writing: 706 Waiting: 25153

Let's count requests:
accepts: 831 rps
handled: 831 rps
requests: 13874 rps

Why last value is much larger than others? The only idea so far - several requests via keepalive connection. Am I right?

Regards,
Alex