condition mean min max ZT0-3 315.824958 315.824958 315.824958 ZT4-7 241.17202400000002 241.17202400000002 241.17202400000002 ZT8-11 232.158926 232.158926 232.158926 ZT12-15 278.478657 278.478657 278.478657 ZT16-19 491.5319495 491.5319495 491.5319495 ZT20-23 686.470615 686.470615 686.470615