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. 2022 Jun 15;19(12):7330. doi: 10.3390/ijerph19127330

Table 4.

Parallel trend test.

(1) (2)
Variable Name Lnpa Lnino
before 6 0.0993 0.1001
(0.0789) (0.0995)
before 5 0.4505 0.1382
(0.3097) (0.0876)
before 4 0.0959 0.1218
(0.0761) (0.0818)
before3 0.4505 0.2257
(0.3097) (0.2326)
before 2 0.3340 0.3339
(0.2790) (0.2789)
before 1 0.2531 0.2265
(0.2691) (0.2807)
Current 0.3225 *** 0.1212 *
(0.0655) (0.0728)
after 1 0.3496 *** 0.1813 **
(0.0935) (0.0792)
after 2 0.2150 *** 0.1637 **
(0.0824) (0.0673)
Constant 48.8976 *** 20.3127 ***
(2.4132) (0.6823)
Observations 14,762 14,762
R-squared 0.7641 0.7640
Control variables YES YES
year FE YES YES
individual FE YES YES

Notes: ***, ** and * denote significance levels of 1%, 5% and 10%, respectively; values in brackets are robust standard errors of clustering, and “YES” indicates controlling for firm and year fixed effects, as below.