pg_stat_user_indexes view clarification

Can someone set me straight on whether the following statements are true in
postgresql-8.1.x and if they aren't true, what queries might I need to run to
find these answers?

Also would be interested to know if these changed in a certain version of
postgresql.

The following query shows all indexes which are not used.

select schemaname,relname,indexrelname,idx_tup_read,idx_tup_fetch from
pg_stat_user_indexes where idx_tup_read = 0;


The following query shows all indexes which have differing values between
idx_tup_read and idx_tup_fetch indicating indexes which likely need rebuilt
via REINDEX:

select schemaname,relname,indexrelname,idx_tup_read,idx_tup_fetch from
pg_stat_user_indexes where idx_tup_read != idx_tup_fetch;


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