condition mean min max ZT0-3 16.807675 16.807675 16.807675 ZT4-7 14.9401465 14.9401465 14.9401465 ZT8-11 14.280136 14.280136 14.280136 ZT12-15 14.028251 14.028251 14.028251 ZT16-19 11.109383000000001 11.109383000000001 11.109383000000001 ZT20-23 12.6084455 12.6084455 12.6084455