How to decrypt received load testing data?

Question

Nginx

The ab utility tested the server
and got the following data:

[email protected]myserver / # ab -n 1000 -c 100 http://myserver.ru/index.php
This is ApacheBench, Version 2.3 <$Revision: 1706008 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking myserver.ru (be patient)
Completed 100 requests
Completed 200 requests
Completed 300 requests
Completed 400 requests
Completed 500 requests
Completed 600 requests
Completed 700 requests
Completed 800 requests
Completed 900 requests
Completed 1000 requests
Finished 1000 requests


Server Software:        nginx
Server Hostname:        myserver.ru
Server Port:            80

Document Path:          /index.php
Document Length:        20216 bytes

Concurrency Level:      100
Time taken for tests:   18.961 seconds
Complete requests:      1000
Failed requests:        0
Total transferred:      20635000 bytes
HTML transferred:       20216000 bytes
Requests per second:    52.74 [#/sec] (mean)
Time per request:       1896.061 [ms] (mean)
Time per request:       18.961 [ms] (mean, across all concurrent requests)
Transfer rate:          1062.80 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    1   4.3      0      18
Processing:   182 1812 315.8   1876    2136
Waiting:      182 1812 315.8   1876    2135
Total:        192 1813 312.5   1876    2136

Percentage of the requests served within a certain time (ms)
  50%   1876
  66%   1909
  75%   1935
  80%   1956
  90%   1994
  95%   2021
  98%   2053
  99%   2071
 100%   2136 (longest request)

The question is, how many concurrent users can this server handle?
I understand that the test is synthetic, but at least plus or minus
Thank you!