condition mean min max ZT0-3 476.170251 476.170251 476.170251 ZT4-7 396.5248415 396.5248415 396.5248415 ZT8-11 387.090559 387.090559 387.090559 ZT12-15 442.7415165 442.7415165 442.7415165 ZT16-19 560.2278014999999 560.2278014999999 560.2278014999999 ZT20-23 609.375592 609.375592 609.375592