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Table 6 WTP estimates (2008 US dollars) and 90% empirical confidence intervalsa

From: Impact of environmental and social attitudes, and family concerns on willingness to pay for improved air quality: a contingent valuation application in Mexico City

  Mean 90% confidence interval
Lower bound Upper bound
Neither problem is very important (N) 261.65 193.77 335.86
Air pollution is very important (A) 301.98 230.97 379.93
Poverty/economic development is very important (P) 221.68 163.75 284.76
Both problems are very important (BP) 311.28 242.07 388.38
Family member suffers respiratory illness or allergy (I) 294.76 219.53 377.60
 (I) + (A) 335.08 256.78 422.13
 (I) + (P) 254.79 191.04 325.91
 (I) + (BP) 344.38 267.72 430.15
More adults than sample median (M) 213.69 150.48 282.62
 (M) + (A) 254.01 188.29 324.62
 (M) + (P) 173.73 119.58 231.33
 (M) + (BP) 263.32 199.03 333.89
  1. a10,000 Krinsky–Robb repetitions