Relationship of pregnant women’s demographic and obstetrical history characteristics with the PA intensity based on the results of multiple linear regression analysis
| Independent variables | Unstandardised coefficients B | Standardised coefficient beta | 95% CI for B | P value* | R2 | |
| Prepregnancyor early pregnancy BMI (kg/m2) | Underweight | Reference category | 0.261 | |||
| Normal | 8.63 | 0.16 | −0.63 to 23.9 | 0.269 | ||
| Overweight | 10.82 | 0.2 | −4.38 to 26.1 | 0.162 | ||
| Obese | 25.6 | 0.36 | 9.35 to 41.81 | 0.002 | ||
| Ethnicity | Fars | 16.94 | 0.12 | 1.81 to 32.06 | 0.028 | |
| Lur | −8.24 | −0.08 | −18.66 to 2.18 | 0.121 | ||
| Lak | 2.96 | 0.02 | −13.23 to 19.17 | 0.719 | ||
| Kurdish | Reference category | |||||
| Level of education | Secondary | −5.24 | −0.05 | −16.80 to 6.31 | 0.372 | |
| Diploma | −8.77 | −0.15 | −15.10 to −2.44 | 0.007 | ||
| University education | Reference category | |||||
| No of children | 5.95 | 0.15 | 1.52 to 10.38 | 0.009 | ||
| Gestational age (weeks) | 0.81 | 0.26 | 0.40 to 1.22 | <0.001 | ||
| Participation in childbirth preparation classes | Yes | −11.27 | −0.13 | −21.28 to −1.25 | 0.028 | |
| No | Reference category | |||||
| A habit of exercising before pregnancy | Yes | 6.09 | 0.11 | 0.46 to 11.73 | 0.034 | |
| No | Reference category | |||||
| Income (millions of rials) | Undesirable <20 | 3.86 | 0.04 | −6.70 to 14.42 | 0.473 | |
| Fairly favourable: 20–40 | −9.22 | −0.17 | −15.28 to −3.16 | 0.003 | ||
| Optimal: 40–100 | Reference category | |||||
*Significance level: p<0.05, bold entries are significant results and are related to statistical tests.
BMI, body mass index; PA, physical activity.