“…Importantly, the development of decreased cervical lordosis has been associated with exacerbation of the Neck Disability Index (NDI) and Visual Analogue Scale (VAS) for neck pain [ 26 ]. However, a previous study of spinal alignment in asymptomatic volunteers has reported that optimal cervical spine alignment varies with age [ 27 ]. For example, the normal range of cervical lordosis is 16 ± 16° for women in their 30s and 25 ± 16° for those in their 60s [ 28 ].…”