## 5 Conclusions
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Single and Multipollutant Models**} & \multicolumn{2}{c}{**Low Birth Weight +2500 g**} & \multicolumn{2}{c}{**Spring–Summer (Warm Season)**} & \multicolumn{2}{c}{**Autumn–Winter (Cold Season)**} \\ \cline{2-7}  & **Crude RR** & **Adjusted RR** & **Crude RR** & **Adjusted RR** & **Crude RR** & **Adjusted RR** \\  & **(95\% CD)** & **(95\% CD)**1  & **(95\% CD)** & **(95\% CD)2  & **(95\% CD)2 ** & **(95\% CD)2 ** & **(95\% CD)2 ** & **(95\% CD)2 ** \\ \hline \multirow{2}{*}{\(PM_{2.5}\)(\(Q_{2}\geq 2.21\)\(\mu g\)m\({}^{3}\)) 3  } & 1.42 & 1.39 & **2.31** & 0.67 & 0.56 \\  & (0.91–2.21) & (0.88–2.20) & **(1.29–4.15)** & **(1.28–4.16)** & (0.28–1.57) & (0.22–1.43) \\  & **1.65** & 1.56 & **2.99** & **2.69** & 0.69 & 0.59 \\  & **(1.04-2.61)** & (0.98–2.48) & **(1.62–5.53)** & **(1.46–49)** & (0.29–1.65) & (0.23–1.51) \\  & 1.09 & 1.05 & **2.69** & 2.45 & 0.41 & 0.34 \\  & (0.55–2.15) & (0.52–2.11) & **(1.06–6.83)** & (0.94–6.37) & (0.14–1.17) & (0.11–1.07) \\ \hline \multirow{2}{*}{\(PM_{10}\)(\(Q_{2}\geq 24.1\)\(\mu g\)m\({}^{3}\)) 3  } & 1.30 & 1.26 & **2.05** & **2.00** & 0.63 & 0.54 \\  & (0.83–2.04) & (0.79–2.00) & **(1.14–3.63)** & **(1.11–3.62)** & (0.27–1.49) & (0.21–1.37) \\  & 0.73 & 0.71 & 0.65 & 0.60 & 0.64 & 0.57 \\  & (0.39–1.35) & (0.38–1.32) & (0.29–1.46) & (0.26–1.35) & (0.23–1.81) & (0.19–1.72) \\  & 1.15 & 1.08 & 2.39 & 2.32 & 0.50 & 0.42 \\  & (0.57–2.31) & (0.52–2.25) & (0.88–6.48) & (0.82–6.60) & (0.17–1.51) & (0.13–1.35) \\ \hline \multirow{2}{*}{\(NO_{2}\) (\(Q_{2}\geq 5.1\)\(\mu g\)m\({}^{3}\)) 3  } & 1.31 & 1.30 & 1.69 & 1.69 & 0.92 & 0.85 \\  & (0.83–2.05) & (0.81–2.06) & (0.94–3.06) & (0.93–3.09) & (0.43–1.97) & (0.38–1.92) \\  & 1.18 & 1.22 & 0.83 & 0.83 & 1.40 & 1.46 \\  & (0.58–2.37) & (0.58–2.55) & (0.30–2.26) & (0.29–2.40) & (0.53–3.69) & (0.52–4.07) \\  & 0.81 & 0.78 & 1.08 & 0.88 & 0.57 & 0.58 \\  & (0.38–1.73) & (0.35–1.73) & (0.37–3.14) & (0.27–2.83) & (0.18–1.76) & (0.18–1.87) \\ \hline \multirow{2}{*}{\(CO\) (\(Q_{2}\geq 32.97\) ppb) 3  } & **1.80** & **1.81** & **3.40** & **3.53** & 0.76 & 0.67 \\  & **(1.18–2.70)** & **(1.17–2.80)** & **(1.87–6.18)** & **(1.93–6.48)** & (0.34–1.69) & (0.28–1.59) \\  & **2.01** & **1.94** & **4.20** & 3.92 & 0.78 & 0.69 \\  & **(1.30–3.10)** & **(1.25–3.03)** & **(2.28–7.76)** & **(2.11–7.30)** & (0.34–1.75) & (0.29–1.64) \\  & **2.27** & **4.64** & **5.16** & 0.97 & 0.91 \\  & **(1.24–4.01)** & **(1.26–4.09)** & **(2.04–10.55)** & **(2.24–11.89)** & (0.37–2.56) & (0.33–2.56) \\  & **1.90** & **1.88** & **6.10** & **5.93** & 0.49 & 0.45 \\  & **(1.00–3.60)** & **(0.99–3.57)** & **(2.70–13.76)** & **(2.59–13.58)** & (0.18–1.37) & (0.16–1.33) \\ \hline \multirow{2}{*}{\(SO_{2}\) (\(Q_{2}\geq 4.7\) ppb) 3  } & 1.52 & 1.51 & **1.83** & **1.92** & 1.22 & 1.12 \\  & (0.98–2.35) & (0.96–2.36) & **(1.02–3.29)** & **(1.06–3.49)** & (0.61–2.47) & (0.54–2.34) \\  & **1.82** & **1.75** & **2.35** & **2.34** & 1.33 & 1.23 \\  & **(1.15–2.89)** & **(1.10–2.80)** & **(1.27–4.36)** & **(1.26–4.35)** & (0.64–2.76) & (0.57–2.65) \\  & 1.42 & 1.45 & 0.83 & 0.92 & 2.04 & 2.03 \\  & (0.73–2.79) & (0.73–2.90) & (0.32–2.11) & (0.35–2.42) & (0.86–4.84) & (0.83–4.93) \\  & 0.93 & 0.94 & 0.46 & 0.50 & 1.89 & 1.78 \\  & (0.48–1.80) & (0.49–1.82) & (0.20–1.2) & (0.22–1.12) & (0.77–4.62) & (0.71–4.43) \\  & 1.79 & 1.83 & 1.72 & 2.14 & 1.84 & 1.64 \\  & (0.86–3.74) & (0.85–3.95) & (0.59–4.98) & (0.67–6.85) & (0.65–5.20) & (0.57–4.70) \\ \hline \hline \end{tabular}
\end{table} 
Table 10: The effects of air pollution exposure during entire pregnancy on low birth weight less than 2500 g (N = 2517), The Espoo Cohort Study, 1984–1990.