condition mean min max ZT0-3 468.239262 468.239262 468.239262 ZT4-7 340.27679049999995 340.27679049999995 340.27679049999995 ZT8-11 290.0453745 290.0453745 290.0453745 ZT12-15 480.436647 480.436647 480.436647 ZT16-19 481.80925349999995 481.80925349999995 481.80925349999995 ZT20-23 493.050265 493.050265 493.050265