The 100-point visual analogue scale (VAS) metrics for pain during intrauterine device (IUD) insertion procedure
| VAS number | Reporting time point during IUD insertion process |
| VAS #1 | Prior to placement of the speculum |
| VAS #2 | After placement of the speculum |
| VAS #3* | After attaching the suction (fourth turn of the knob) or the tenaculum device |
| VAS #4 | After adjusting the suction or tenaculum device |
| VAS #5 | Immediately after IUD insertion |
| VAS #6 | Immediately after suction or tenaculum was removed |
| VAS #7 | After the speculum was removed |
| VAS #8 | The day after the procedure |
*VAS 3 and VAS 4 differ in Stage 3 by randomisation to either the Bioceptive suction cervical retractor (SCR) device or the single-tooth tenaculum.