Table 2– Potential errors in forced expiratory volume in 1 s (FEV1) in boys caused by switching reference equations at the 18th birthday
Age 17.99 yrsAge 18.0 yrs
GLI 2012 [2]Crapo et al. [13]ECSC/ERS [14]Falaschetti et al. [15]Hankinson et al. [11]SAPALDIA [16, 17]
Absolute error mL
 GLI 2012 [2]#0-161–478-433–127-49–74-267–34-286–118
 Hankinson et al. [11]#-33–268107–445-165–9941–2180-18–85
 Knudson et al. [12]#263–450289–80516–454299–401164–361164–445
 Polgar et al. [3]192–53831–1017-241–666143–613-75–573-94–656
 Quanjer et al. [9]-413–181-574–659-846–308-462–255-680–215-699–299
 Rosenthal et al. [5]364–930384–1309111–982300–979261–898259–959
 Wang et al. [4]61–313152–539-120–192135–26446–9527–179
 Zapletal et al. [7]401–681241–1160-32–809352–756135–716116–800
Error % pred
 GLI 2102 [2]#0-3–16-8–4-1–3-5–1-5–4
 Hankinson et al. [11]#-1–5-2–15-3–31–400–3
 Knudson et al. [12]#7–126–310–177–153–143–17
 Polgar et al. [3]4–221–42-4–273–25-1–24-2–27
 Quanjer et al. [9]-7–6-9–24-14–11-8–9-11–8-12–11
 Rosenthal et al. [5]9–348–542–389–355–345–37
 Wang et al. [4]2–63–19-2–6-5–51–31–6
 Zapletal et al. [7]8–305–51-1–357–333–312–35
  • The range of differences between predicted values for FEV1 at 17.99 and 18.0 yrs for 282 boys of identical height are shown both in mL and % predicted, according–various reference equations. For example, switching from Quanjer's equations at 17.99 yrs–the Global Lungs Initiative (GLI) 2012 equations at 18.0 yrs, predicted FEV1 goes down by as much as 413 mL or up by 181 mL, depending on the subject's height; this represents a change of between -7% and +6% of the predicted value at age 17.99 yrs. Findings for Stanojevic et al. [10] were very similar–those of GLI 2012. ECSC: European Community for Steel and Coal. #: equation spanning childhood and adults; : paediatric data only.