. 2017 May 31;12(5):e0177782. doi: 10.1371/journal.pone.0177782

Table 3. Mean percent visual area (PVA) enabled by speculum, flat tip and curved tip inserter designs under 500 cm H₂O pressure and various uterine positions (normal, anteverted, retroverted and sideverted).

Uterine Position	Normal Position	Anteverted	Retroverted	Sideverted
Speculum mean PVA (%)	100 +/- 0	75.8 +/-4	92.0 +/- 5.3	66.5 +/-4
Flat tip inserter mean PVA (%)	95.78 +/- 3.92	75+/-1.2	51.9 +/- 2.1	59.2 +/- 5.4
Curved tip inserter mean PVA (%)	95.4 +/-4.5	100 +/-0	93.8 +/-4.3	96.9 +/- 3.8

Table 3. Mean percent visual area (PVA) enabled by speculum, flat tip and curved tip inserter designs under 500 cm H2O pressure and various uterine positions (normal, anteverted, retroverted and sideverted).