condition mean min max ZT0-3 0.203631725 0.20167445 0.20558900000000002 ZT4-7 0.06826575 0.06826575 0.06826575 ZT8-11 0.2523175 0.2523175 0.2523175 ZT12-15 0 0 0 ZT16-19 0.31446050000000003 0.31446050000000003 0.31446050000000003 ZT20-23 0.315855 0.315855 0.315855