condition mean min max ZT0-3 865.585661 865.585661 865.585661 ZT4-7 754.3289055 754.3289055 754.3289055 ZT8-11 683.7912114999999 683.7912114999999 683.7912114999999 ZT12-15 1036.1567725 1036.1567725 1036.1567725 ZT16-19 1196.7449365 1196.7449365 1196.7449365 ZT20-23 1189.947782 1189.947782 1189.947782