condition mean min max ZT0-3 1436.372639 1436.372639 1436.372639 ZT4-7 920.0761745 920.0761745 920.0761745 ZT8-11 1332.8947195 1332.8947195 1332.8947195 ZT12-15 1536.4570625 1536.4570625 1536.4570625 ZT16-19 2131.7781725 2131.7781725 2131.7781725 ZT20-23 2753.052149 2753.052149 2753.052149