condition mean min max ZT0-3 323.60613 323.60613 323.60613 ZT4-7 316.176928 316.176928 316.176928 ZT8-11 291.8952905 291.8952905 291.8952905 ZT12-15 266.17143599999997 266.17143599999997 266.17143599999997 ZT16-19 268.4149675 268.4149675 268.4149675 ZT20-23 234.34627849999998 234.34627849999998 234.34627849999998