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Table 5 Distribution of possible confounders among age-related subgroups in total numbers and rounded percentages

From: Results of advanced core decompression in patients with osteonecrosis of the femoral head depending on age and sex—a prospective cohort study

Possible confounderAge-related ubgroups (count and percentage)
< 30 years≥ 30/< 40 years≥ 40/< 50 years≥ 50 years
Lesion Size< 15%1 (11.1%)2 (12.5%)2 (7.4%)2 (5.9%)
≥ 15/≤ 30%4 (44.4%)8 (50%)15 (55.6%)22 (64.7%)
> 30%4 (44.4%)6 (37.5%)10 (37.0%)10 (29.4%)
Total9 (100%)16 (100%)27 (100%)34 (100%)
 p= 0.92
Alpha angle< 50°2 (22.2%)3 (18.8%)7 (25.9%)8 (23.5%)
≥ 50°/< 60°3 (33.3%)5 (31.3%)7 (25.9%)10 (29.4%)
≥ 60°4 (44.4%)8 (50.0%)13 (48.1%)16 (47.1%)
Total9 (100%)16 (100%)27 (100%)34 (100%)
 p = 0.99
Risk factorNo4 (44.4%)8 (50.0%)11 (40.7%)19 (55.9%)
Yes5 (55.6%)8 (50.0%)16 (59.3%)15 (44.1%)
Total9 (100%)18 (100%)27 (100%)34 (100%)
 p = 0.69
Treatment typeACD5 (55.6%)7 (43.75%)15 (55.6%)19 (55.9%)
mACD4 (44.4%)9 (56.25%)12 (44.4%)15 (44.1%)
Total9 (100%)16 (100%)27 (100%)34 (100%)
 p= 0.86