condition mean min max ZT0-3 11.311203 11.311203 11.311203 ZT4-7 10.204202 10.204202 10.204202 ZT8-11 11.103772 11.103772 11.103772 ZT12-15 11.0768285 11.0768285 11.0768285 ZT16-19 12.345115 12.345115 12.345115 ZT20-23 11.429504000000001 11.429504000000001 11.429504000000001