The Importance of Exercise and General Mental Health on Prediction of Property-Damage-Only Accidents among Taxi Drivers in Tehran: A Study Using ANFIS-PSO and Regression Models

Table 1

Items of GHQ-12.

1	Able to concentrate
2	Loss of sleep over worry
3	Playing a useful part
4	Capable of making decisions
5	Felt constantly under strain
6	Couldn’t overcome difficulties
7	Able to enjoy day-to-day activities
8	Able to face problems
9	Feeling unhappy and depressed
10	Losing confidence
11	Thinking of self as worthless
12	Feeling reasonably happy