condition mean min max ZT0-3 1463.377633 1463.377633 1463.377633 ZT4-7 1242.5867680000001 1242.5867680000001 1242.5867680000001 ZT8-11 2082.0815155 2082.0815155 2082.0815155 ZT12-15 2112.7182215 2112.7182215 2112.7182215 ZT16-19 2989.879801 2989.879801 2989.879801 ZT20-23 2159.7663705 2159.7663705 2159.7663705