condition mean min max ZT0-3 51.198782 51.198782 51.198782 ZT4-7 45.953612 45.953612 45.953612 ZT8-11 52.320735 52.320735 52.320735 ZT12-15 66.273957 66.273957 66.273957 ZT16-19 67.0801235 67.0801235 67.0801235 ZT20-23 77.891659 77.891659 77.891659