Result: Mean age was 51; the rate of male was higher than female (63.6% vs 36.3%), age-group 41 - 60 was frequent (54.5%).
Kết quả: Tuổi trung bình 51; tỷ lệ nam nhiều hơn nữ (63,6% so với 36,3%), nhóm tuổi hay gặp là 40-60 (54,5%).