Mysql slow query log not tally with mysqladmin

I have enabled my slow query log. So I saw the query which was taking some time then I did some indexing it improve and my slow query log is not being showing any more queies. But when I run this command

mysqladmin -u root -p status
Enter password:
Uptime: 9395  Threads: 2  Questions: 474976  Slow queries: 13  Opens: 99  Flush tables: 1  Open tables: 54  Queries per second avg: 50.556

It is showing me slow queries:13. What does the thread n questions means here?

Here is how I set my.cnf file.

    [mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
log-slow-queries = /var/log/mysql/mysql-slow.log
long_query_time = 2
log_warnings = 2
# Default to using old password format for compatibility with mysql 3.x
# clients (those using the mysqlclient10 compatibility package).
old_passwords=1

# Disabling symbolic-links is recommended to prevent assorted security risks;
# to do so, uncomment this line:
# symbolic-links=0

[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid