condition mean min max ZT0-3 10.54615 10.54615 10.54615 ZT4-7 8.288170000000001 8.288170000000001 8.288170000000001 ZT8-11 11.244475000000001 11.244475000000001 11.244475000000001 ZT12-15 21.52725 21.52725 21.52725 ZT16-19 28.052799999999998 28.052799999999998 28.052799999999998 ZT20-23 18.8506 18.8506 18.8506