condition mean min max ZT0-3 4.89527 4.69933 5.09121 ZT4-7 6.7122399999999995 6.7122399999999995 6.7122399999999995 ZT8-11 6.834245 6.834245 6.834245 ZT12-15 0 0 0 ZT16-19 7.33185 7.33185 7.33185 ZT20-23 8.926415 8.926415 8.926415