condition mean min max ZT0-3 663.488827 663.488827 663.488827 ZT4-7 2196.145362 2196.145362 2196.145362 ZT8-11 2587.972783 2587.972783 2587.972783 ZT12-15 2430.7238215 2430.7238215 2430.7238215 ZT16-19 1011.91535 1011.91535 1011.91535 ZT20-23 388.16849 388.16849 388.16849