Fig. 1

Seasonal changes of the subscale scores of the HR-QoL measured by the COOP/WONCA charts (a) and SF-36v2 (b) in the COPD, BA and control groups. The raw scores of SF-36v2 were converted to subscale scores. Data are presented as mean ± standard error of the mean (Additional file 1: Table S1). The COOP/WONCA charts items were represented as follows: physical fitness, PF; feelings, FE; daily activities, DA; social activities, SA; change in health, CH; overall health, OH; pain, PA; quality of life, QL. The subscales of SF-36v2 were represented as follows; physical functioning, PF; role limitations due to physical health problems, RP; bodily pain, BP; general health perceptions, GH; vitality, VT; social functioning, SF; role limitations due to emotional problems, RE; and mental health, MH. * P < 0.05; **P < 0.01; ***P < 0.005; ****P < 0.001; *****P < 0.0001 versus control. ^# P < 0.05; ^## P < 0.01; ^### P < 0.005; ^#### P < 0.001 versus COPD group