Table 2.

Newly derived Tanzanian spirometric reference equations.

Outcome (sex-specific)	Tanzanian population
FVC (males)	–4.553 – 0.011*age + 0.053*height RSS = 0.49; adj R2 = 0.66
FVC (females)	–0.487 – 0.024*age + 0.027*height RSS = 0.49; adj R2 = 0.66
FEV1 (males)	–3.127 – 0.024*age + 0.044*height RSS = 0.42; adj R2 = 0.70
FEV1 (females)	–0.676 – 0.024*age + 0.025*height RSS = 0.42; adj R2 = 0.70
Ratio FEV1/FVC (males)	0.947 – 0.004* age RSS = 0.06; adj R2 = 0.34
Ratio FEV1/FVC (females)	0.947 – 0.004*age RSS = 0.06; adj R2 = 0.34

FVC = forced vital capacity; adj = adjusted; RSS = residual sum of squares; FEV₁ = forced expiratory volume in 1 sec.