condition mean min max ZT0-3 2.3252545419999997 0.715105313 3.935403771 ZT4-7 9.289178854 7.0342454055 11.5441123025 ZT8-11 19.124644515 16.12938624 22.119902789999998 ZT12-15 11.4480772505 7.772468485000001 15.123686016 ZT16-19 3.6275795132499997 2.8042407149999997 4.4509183115 ZT20-23 1.886875672 1.3320243585 2.4417269855