Meanings of index quantity in English

An index number over 100 indicates that optimists outnumber pessimists.

The average total acts as the official "crime index number".

While I waited to be put through I wrote the index number on my arm with the biro Lesley handed me.

Economists said the sharp downward revision to the first-quarter inflation rate raised the risk of a lower core PCE price index number in April.

When Middletown had finished it was easy to see that the squares of highest index number did not fall at random on the chart.