condition mean min max ZT0-3 280.67583333333334 178.129 337.945 ZT4-7 160.357 160.357 160.357 ZT8-11 204.0525 204.0525 204.0525 ZT12-15 421.34875 383.312 459.3855 ZT16-19 497.9225 497.9225 497.9225 ZT20-23 582.6310000000001 582.6310000000001 582.6310000000001