condition mean min max ZT0-3 27.472649999999998 14.55525 34.2088 ZT4-7 14.521650000000001 14.521650000000001 14.521650000000001 ZT8-11 16.2273 16.2273 16.2273 ZT12-15 23.183125 22.74405 23.6222 ZT16-19 25.5278 25.5278 25.5278 ZT20-23 38.66065 38.66065 38.66065