**3. Method**

A quantitative method was adopted for this study with a structured questionnaire of 443 distributed to the construction professionals in the Federal Capital Territory, Abuja, Nigeria. To achieve a degree of generalization, the construction professionals' population that was considered were Architects, Quantity Surveyors, Engineers, and Builders in the Federal Capital Territory, Abuja, Nigeria. To ascertain the total number of members of each of the professional bodies, a request was sent to them. The sampling frame is 8974. The number of respondents was calculated at a 95% confidence level with a maximum error of 5%. The sampling size is 443. The questionnaires were proportionally allotted according to the profession through a stratified sampling method. The measurement scale of the questionnaire is illustrated in **Table 1**, in which respondents chose options arranged in a 5-point Likert scale from strongly agree to strongly disagree.



*Approaches to Improving Occupational Health and Safety of the Nigerian Construction Industry DOI: http://dx.doi.org/10.5772/intechopen.113011*


**Table 1.**

*Measurement scale of approaches to improving OHS.*

#### **3.1 Data analysis**

A total number of 399 questionnaires were returned out of 443 distributed. Exploratory factor analysis (EFA) was conducted on the data with SPSS software version 26. The confirmatory factor analysis (CFA) was used to validate the factors obtained from EFA. The CFA was conducted through structural equation modeling-AMOS. Some indices were used to evaluate the goodness-of-fit index of the CFA model. These indices include root means square error of approximation (RMSEA), the goodness-of-fit index, adjusted goodness-of-fit index, comparative fit index (CFI), and normal fit index [38]. SPSS software version 26 was used for descriptive analyses.
