Table 1 Patient demographic data.
SDRRT | ASR (Notched rods) | ASR (Notch-free rods) | Overall P value | Steel-Dwass P value | |||
|---|---|---|---|---|---|---|---|
SDRRT vs. ASR (Notched rods) | SDRRT vs. ASR (Notch-free rods) | ASR (Notched rods) vs. ASR (Notch-free rods) | |||||
Number of patients (no.) | 31 | 59 | 36 | ||||
Age at surgery (years) | 15.2 ± 2.4 (10–20) | 14.8 ± 2.3 (11–20) | 14.1 ± 2.3 (10–20) | 0.193 | |||
Sex (no. and % of female)* | 28 (90.3%) | 57 (96.6%) | 33 (91.2%) | 0.300 | |||
Risser sign (grade) | 3.9 ± 1.2 (0–5) | 3.6 ± 1.5 (0–5) | 3.6 ± 1.5 (0–5) | 0.673 | |||
Body mass index (kg/m2) | 18.9 ± 1.7 (15.2–22.2) | 18.8 ± 2.1 (14.2–25.1) | 19.7 ± 3.1 (15.5–28.7) | 0.652 | |||
Cobb length (segments) (upper end to lower end vertebra) | 7.0 ± 1.0 (5–9) | 6.9 ± 1.0 (5–9) | 7.2 ± 1.0 (6–10) | 0.697 | |||
Operation time (min) | 274.1 ± 45.5 (180–380) | 271.0 ± 48.4 (159–376) | 241.8 ± 44.4 (126–322) | 0.009 | 0.8572 | 0.029 | 0.015 |
Estimated blood loss (mL) | 855.8 ± 510.1 (200–2780) | 753.9 ± 430.8 (180–2140) | 620.9 ± 365.4 (170–2000) | 0.099 | |||
Follow-up periods (months) | 24.6 ± 1.3 (24–29) | 24.4 ± 1.1 (24–28) | 24.4 ± 0.9 (24–28) | 0.876 | |||
Lumbar modifier (no. and %)* | 0.686 | ||||||
A | 17 (54.8%) | 33 (55.9%) | 23 (63.9%) | ||||
B | 7 (22.6%) | 8 (13.6%) | 5 (13.9%) | ||||
C | 7 (22.6%) | 18 (30.5%) | 8 (22.2%) | ||||
Number of instrumented vertebrae (segments) | 8.6 ± 1.5 (6–11) | 9.6 ± 1.2 (7–12) | 9.6 ± 1.3 (7–12) | 0.006 | 0.008 | 0.019 | 0.964 |
