Table 3: Odd’s ratio of each risk factor.

Risk factors T score < –1T score > −1 < −2.5Odd’s ratio95% confidence intervalChi square ( value)

Familiarity +4826161.00.45–2.4 NS
Familiarity −623621
BMI < 19 kg/m24111248.63.55–21.87 <0.0005
BMI ≥ 19 kg/m2695113
Menarche > 15 years5020243.91.64–9.16 <0.0005
Menarche < 15 years604213
Amenorrhoea +5215267.42.97–18.47 <0.0005
Amenorrhoea −584711
Nulliparity +4812258.73.41–22.07 <0.0005
Nulliparity −625012
Smoking +4017162.00.86–4.75 NS
Smoking −704521

NS: not statistically significant.