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Table 1: 
Patient demographics
Group 1Group 2Group 3
No. of patients (female %)328 (70%)226 (64%)101 (66%)
Mean age by year (SD)75 (11)74 (12)73 (11)
Median % of available patients in different follow-up time points (range)68% (22%–93%)70% (32%–92%)70% (26%–93%)
No. of levels328539328
Upper thoracic (T1–T4)1 (0.5%)8 (1%)7 (2%)
Mid thoracic (T5–T8)64 (19.5%)85 (16%)55 (17%)
Lower thoracic (T9–T12)100 (30.5%)171 (32%)112 (34%)
Upper lumbar (L1–L3)125 (38%)199 (37%)115 (35%)
Lower lumbar (L4–L5)35 (10.5%)76 (14%)38 (11.5%)
Sacrolplasty3 (1%)01 (0.5%)