Figure 3 .

Asthma severity scores in three groups of asthmatic children, one monitoring symptoms only (dashed line), one monitoring peak expiratory flow (PEF) at home on a daily basis (thin solid line), and one monitoring PEF at home only when symptomatic for one year. Although there was a trend towards a difference in asthma severity between symptom only monitoring and PEF monitoring after three months (p = 0.07) this difference disappeared during further follow up (after Yoos et al²⁴).