condition mean min max ZT0-3 949.868056 949.868056 949.868056 ZT4-7 1159.0838215 1159.0838215 1159.0838215 ZT8-11 894.7541994999999 894.7541994999999 894.7541994999999 ZT12-15 935.8575814999999 935.8575814999999 935.8575814999999 ZT16-19 661.5585165 661.5585165 661.5585165 ZT20-23 490.6544565 490.6544565 490.6544565