condition mean min max ZT0-3 189.155134 189.155134 189.155134 ZT4-7 217.2090865 217.2090865 217.2090865 ZT8-11 233.2439865 233.2439865 233.2439865 ZT12-15 237.1557335 237.1557335 237.1557335 ZT16-19 253.7951095 253.7951095 253.7951095 ZT20-23 244.61459050000002 244.61459050000002 244.61459050000002