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Table 3 Estimated coefficients of the segmented regression model for the monthly number of products, procurement volumes, and average delivery time of LCMs before and after the LCM policy intervention in October 2015, Shandong Province, China

From: The effects of pricing policy on the prices and supply of low-cost medicines in Shandong, China: evidence from an interrupted time series analysis

Parameter

Value (SE)

t

P

[95% Conf. Interval]

Number of products types

 Intercept

420.92 (11.39)

36.99

< 0.001

[397.71, 444.13]

 Pre-intervention slope a

2.51 (1.04)

2.41

0.022

[0.38, 4.64]

 Post-intervention slope c

30.02 (5.38)

5.58

< 0.001

[19.04, 40.99]

 Change in slope b

27.50 (5.43)

5.07

< 0.001

[16.43, 38.57]

 Level change in intervention

119.42 (60.21)

1.98

0.056

[−3.39, 242.23]

Procurement volumes of all LCMs (packages)

 Intercept

2,071,127.00 (117,796.50)

17.58

< 0.001

[1,830,880.00, 2,311,375.00]

 Pre-intervention slope a

19,771.37 (12,044.75)

1.64

0.111

[− 4794.06, 44,336.80]

 Post-intervention slope c

4.74e+ 05 (6.08e+ 04)

7.79

< 0.001

[350,000.00, 598,000.00]

 Change in slope b

454,101.60 (61,447.83)

7.39

< 0.001

[328,777.90, 579,425.30]

 Level change in intervention

− 282,740.10 (382,843.10)

−0.74

0.466

[−10,635,540.00, 498,073.70]

Procurement volumes of 154 LCMs (packages)

 Intercept

1,905,371.00 (122,873.70)

15.51

< 0.001

[1,654,768.00, 2,155,973.00]

 Pre-intervention slope a

12,562.22 (11,348.67)

1.11

0.277

[−10,583.56, 35,707.99]

 Post-intervention slope c

2.42e+ 05 (3.70e+ 04)

6.52

< 0.001

[166,000.00, 317,000.00]

 Change in slope b

229,092.10 (38,127.01)

6.01

< 0.001

[151,331.50, 306,852.60]

 Level change in intervention

−151,236.50 (292,263.30)

−0.52

0.609

[− 747,311.30, 444,838.30]

Average delivery time of all LCMs (days)

 Intercept

30.55 (0.91)

33.66

< 0.001

[28.70, 32.40]

 Pre-intervention slope d

−1.21 (0.07)

−16.66

< 0.001

[− 1.36, − 1.06]

 Post-intervention slope e

−0.08 (0.06)

−1.40

0.171

[−0.20, 0.04]

 Change in slope b

1.13 (0.09)

12.19

< 0.001

[0.94, 1.32]

 Level change in intervention

1.08 (0.87)

1.24

0.223

[−0.69, 2.86]

  1. SE, standard error
  2. a Indicates a non-significant rise in those indicators from month to month before the intervention
  3. b A significant change in the regression slope – indicating a significant increase in those indicators –was noted right after the intervention
  4. c indicates a significant rise was noted right after the intervention
  5. d indicates a significant decrease in average delivery time of LCMs from month to month before the intervention
  6. e indicates a non-significant rise or decrease in average delivery time of LCMs from month to month after the intervention
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BMC Public Health

ISSN: 1471-2458

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