Tab. 2.

Kappa table of agreement between Ultrasound and Digital VE on fetal head position

Overall agreement in the range of 45o
Ultrasound (+)/ (–)
Digital VE (+)/ (–)		+	–	Total:
	+	(n: 68)	(n: 128)	(n: 196)
	–	(n: 0)	(n: 66)	(n: 66)
	Total:	68	194	262
	Observed agreements %	134 (51.15%)	Kappa = 0.211; 95% CI: From 0.151 to 0.271
	Agreements expected by chance %:	99.7 (38.07)
Agreement on occiput posterior positions
Ultrasound (+)/ (–)
Digital VE (+)/ (–)		+	–	Total:
	+	(n: 14)	(n: 56)	(n: 70)
	–	(n: 14)	(n: 112)	(n: 126)
	Total:	(n: 28)	(n: 168)	(n: 196)
	Observed agreements %	126 (64.29%)	Kappa = 0.103; 95% CI: From –0.022 to 0.227
	Agreements expected by chance %:	118.0 (60.209%)
Agreement on transverse positions
Ultrasound (+)/ (–)
Digital VE (+)/ (–)		+	–	Total:
	+	(n: 23)	(n: 70)	(n: 93)
	–	(n: 23)	(n: 80)	(n: 103)
	Total:	(n: 46)	(n: 150)	(n: 196)
	Observed agreements %	103 (52.55%)	Kappa = 0.025 95% CI: From –0.182 to 0.057
	Agreements expected by chance %:	100.7 (51.35%)