Identifying the critical windows and joint effects of greenness and particulate matter exposures for preterm birth: a retrospective study across Guangdong Province in China from 2014 to 2018

Table 3 Associations between NDVI or FVC and PTB within 500 m and 1,000 m buffers in four periods. ^a

PM	Period	NDVI		FVC
PM	Period	OR (95% CI)	P	OR (95% CI)	P
叠耻蹿蹿别谤-500听尘		听	听	听	听
PM_2.5	Trimester 1	0.75 (0.72, 0.78)	&濒迟;鈥�0.001	0.81 (0.78, 0.83)	&濒迟;鈥�0.001
	Trimester 2	0.87 (0.84, 0.90)	&濒迟;鈥�0.001	0.90 (0.88, 0.92)	&濒迟;鈥�0.001
	Trimester 3	0.86 (0.83, 0.89)	&濒迟;鈥�0.001	0.89 (0.87, 0.92)	&濒迟;鈥�0.001
	Entire pregnancy	0.80 (0.70, 0.92)	0.002	0.86 (0.77, 0.95)	0.005
PM₁₀	Trimester 1	0.72 (0.68, 0.76)	&濒迟;鈥�0.001	0.78 (0.75, 0.81)	&濒迟;鈥�0.001
	Trimester 2	0.85 (0.82, 0.88)	&濒迟;鈥�0.001	0.88 (0.86, 0.91)	&濒迟;鈥�0.001
	Trimester 3	0.84 (0.80, 0.88)	&濒迟;鈥�0.001	0.88 (0.85, 0.91)	&濒迟;鈥�0.001
	Entire pregnancy	0.74 (0.63, 0.87)	&濒迟;鈥�0.001	0.81 (0.71, 0.91)	&濒迟;鈥�0.001
Buffer-1,000听m		听	听	听	听
PM_2.5	Trimester 1	0.72 (0.69, 0.76)	&濒迟;鈥�0.001	0.79 (0.76, 0.82)	&濒迟;鈥�0.001
	Trimester 2	0.86 (0.83, 0.89)	&濒迟;鈥�0.001	0.89 (0.87, 0.91)	&濒迟;鈥�0.001
	Trimester 3	0.86 (0.82, 0.89)	&濒迟;鈥�0.001	0.89 (0.86, 0.91)	&濒迟;鈥�0.001
	Entire pregnancy	0.81 (0.70, 0.93)	0.003	0.85 (0.77, 0.95)	0.004
PM₁₀	Trimester 1	0.69 (0.65, 0.73)	&濒迟;鈥�0.001	0.77 (0.73, 0.80)	&濒迟;鈥�0.001
	Trimester 2	0.84 (0.81, 0.88)	&濒迟;鈥�0.001	0.88 (0.85, 0.90)	&濒迟;鈥�0.001
	Trimester 3	0.84 (0.80, 0.87)	&濒迟;鈥�0.001	0.87 (0.85, 0.90)	&濒迟;鈥�0.001
	Entire pregnancy	0.76 (0.64, 0.89)	&濒迟;鈥�0.001	0.81 (0.72, 0.92)	0.001

^a The models were adjusted by maternal age, neonate鈥檚 sex, gravidity, parity, birthing season and temperature

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