condition mean min max ZT0-3 2.90845 2.90845 2.90845 ZT4-7 2.33725 2.33725 2.33725 ZT8-11 2.108775 2.108775 2.108775 ZT12-15 2.6319850000000002 2.6319850000000002 2.6319850000000002 ZT16-19 2.9079050000000004 2.9079050000000004 2.9079050000000004 ZT20-23 2.953945 2.953945 2.953945