condition mean min max ZT0-3 5.8898325 5.8223199999999995 5.957345 ZT4-7 7.28994 7.28994 7.28994 ZT8-11 6.573315 6.573315 6.573315 ZT12-15 0 0 0 ZT16-19 8.855615 8.855615 8.855615 ZT20-23 7.145849999999999 7.145849999999999 7.145849999999999