highly significantP < .0001
There was a highly significant increase of the mean IR for 0° neutral compared to 30° posterior (91° [95% CI: 87°-95°] vs. 87° [95% CI: 83°-90°], P < .0001, d = 5.22) and for 30° anterior compared to 0° neutral (94° [95% CI: 90°-97°] vs. 91° [95% CI: 87°-95°], P < .0001, d = 5.59).