condition mean min max ZT0-3 11.074471 11.074471 11.074471 ZT4-7 10.845802500000001 10.845802500000001 10.845802500000001 ZT8-11 10.786498000000002 10.786498000000002 10.786498000000002 ZT12-15 10.922282500000001 10.922282500000001 10.922282500000001 ZT16-19 11.063349500000001 11.063349500000001 11.063349500000001 ZT20-23 10.7269445 10.7269445 10.7269445