Table 1

Factors analysed in association with club foot in EA cases

Factor	With club foot	Without club foot	p value
Maternal
Height (cm)	161.1	162.1	0.37^1-150
Weight (kg)	67.5	64.9	0.39^1-150
First pregnancy	0%	16.9%	0.07^1-151
Previous premature delivery	10.3%	3.9%	0.08^1-152
Post secondary education	65.5%	75.1%	0.24^1-153
Smoking	17.2%	10.2%	0.22^1-153
Alcohol use	13.4%	10.3%	0.64^1-153

Procedural
Difficult procedure	6.9%	10.0%	0.58^1-153
Uterine position retroverted	0.8%	6.7%	0.75^1-152
Gestation at amnio (days)	84.7	85	0.67^1-150
Fluid volume sampled (ml)	11.3	11.4	0.59^1-150
Membrane tenting	10.3%	10.6%	0.85^1-152
Transplacental approach	10.3%	22.2%	0.13^1-153
Two needle insertions	6.9%	5.3%	0.67^1-152
Cramping	17.2%	14.0%	0.62^1-153
Bleeding	13.8%	6.0%	0.10^1-152

Perinatal
Median birth weight (g)	3152	3484	0.51^1-150
Gestation at delivery (wk)	38.9	39.3	0.29^1-150
Sex distribution (% male)	58.6	50.3	0.37^1-153